Top 10 Step Drill Bit Cobalt – Step Drill Bits

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1. Irwin Tools


IRWIN Step Drill Bit Set, 3-Piece 10502CB

Irwin Tools #ad - Drill bit is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. Drill bit is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. Speedpoint tip for fast starts. Includes #1c, #2c and #3C bits. Drill bits feature a radial concave flute. Includes #1c, #2c and #3C bits. Drill bits feature a radial concave flute. Speedpoint tip for fast starts. Irwin drill bits have laser-marked sizes for simple identification. Irwin drill bits have laser-marked sizes for simple identification.
BrandIrwin Tools #ad
ManufacturerIRWIN #ad
Height1.63 Inches
Length7.75 Inches
Weight0.31 Pounds
Width5.5 Inches
Part Number10502CB

2. CO-Z


CO-Z 5pcs Hss Cobalt Multiple Hole 50 Sizes Step Drill Bit Set with Aluminum Case

CO-Z #ad - Chuck sizes. The board must be smaller in thickness than the height of step drill bits. All the bits come in a well-organized case for easy transport and storage. Cobalt high speed steel along with the titanium coating ensures extreme durability, will stay new and shiny for years to come. Different sized shanks ensure compatibility with 1/4, 3/8 and 1/2 in. Non-walking drill tip provides fast and smooth drills on steel sheets, aluminum sheets, wood board, plastic board etc. Please mark the spot that you are to drill for easier drilling and improved drill bits life.
BrandCO-Z #ad
ManufacturerCO-Z #ad
Height6.1 Inches
Length4.33 Inches
Weight1.15 Pounds
Width1.57 Inches
Part NumberCO-Z SDB-0000
ModelCO-Z SDB-0000



3/8 Inch Shank, TEMO M35 Cobalt Double Flute Step Drill, 9 Size From 1/4 Inch To 3/4 Inch

TEMO #ad - It is widely used in metal manufacturing because of its ability to resist wear over conventional high speed steels, allowing for shorter cycle times in production environments due to higher cutting speeds or from the increase in time between tool changes.

M35 is similar to M2, but with 5% cobalt added. The step drill bit is made with m35 cobalt. M35 hssco is a high speed steel alloy made up of 5% cobalt. They also help to enlarge existing holes. M35 is also less prone to chipping when used for interrupted cuts. 3/8 inch shank with 3 flats to eliminate slipping. 9 hole sizes: 1/4" 6. 35mm, 3/4" 19. 05mm, 5/8" 15. 88mm, 5/16" 7. 94mm, 1/2" 12. 7mm, 9/16" 14. 29mm, 7/16" 11. 11mm, 3/8" 9. 52mm, 11/16" 17. 46mm, with 1/16" 1. 59mm increments.
BrandTEMO #ad
ManufacturerGolden Coulee #ad
Height1 Inches
Length3 Inches
Weight3 ounces
Width1 Inches
Part Number3049



STROTON 4-32mm Metric 6% Cobalt Step Drill Bit for Stainless Steel and Hard Metal 15 Steps

STROTON #ad - 4-32mm 15 steps 4mm, 8mm, 16mm, 20mm, 6mm, 10mm, 26mm, 30mm, 24mm, 18mm, 14mm, 28mm, 12mm, 22mm, 32mm. Grinding the cutting edge three times, desigh for cutting through Stainless steel, aluminum, Iron plate, wood, with the High HRC and Heat Resistance of the Material, Ducts, PVC and Plastic.

This cobalt step drill bit is typically capable of running two to three times Faster. Despite the higher price, the cost per hole when Using Cobalt Drill Bit Will be the Lowest, Since It Can Produce So Many More Holes. Premium m35 6% cobalt steel, 66-69 hrc rockwell hardness Scale, Usually Give the Best Heat, Wear and Chip Resistance and Long Tool Life.
BrandSTROTON #ad
ManufacturerSTROTON Ltd #ad
Part NumberCobalt-15s-(4-32mm)

5. Irwin Tools


Irwin Industrial Tools 10231CB Unibit 1/32-Inch 13-Steps Cobalt Step Drill Bit

Irwin Tools #ad - Irwin drill bits have laser-marked sizes for simple identification. Drill bits feature a radial concave flute. Drill bit is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. Drill bits feature a radial concave flute. Drills 13 hole sizes from 1/8 inch to 1/2 inch in 1/32-inch increments. Drill bit is engineered with M-35-grade cobalt steel for maximum life when drilling in tough steel. Drills 13 hole sizes from 1/8 inch to 1/2 inch in 1/32-inch increments. Irwin drill bits have laser-marked sizes for simple identification.
BrandIrwin Tools #ad
ManufacturerIRWIN #ad
Height1.5 Inches
Length6 Inches
Weight0.05 Pounds
Width3 Inches
Part Number10231cb

6. Irwin Tools


Irwin Industrial Tools 10234CB #4 Unibit 3/16- Inch – 7/8-Inch, 12-Steps Cobalt Step Drill Bit 1/16- Inch Steps

Irwin Tools #ad - Drills 12 different hole sizes, from 3/16" to 7/8" by 16ths. Cobalt high speed steel for extended cutting edge life makes it ideal for drilling stainless steel. Speedpoint tip prevents "walking, " gets fast starts, and eliminates the need for pilot/starting hole. Single-flute cutting edge drills true round holes with smooth, clean finish.
BrandIrwin Tools #ad
ManufacturerIRWIN #ad
Height0.98 Inches
Length7.13 Inches
Weight0 Pounds
Width3.13 Inches
Part Number10234cb

7. Powerextra


Multiple Hole 50 Sizes High Speed Step Drill Bit Set with Aluminum Case, Step Drill Bit Set & Automatic Center Punch 5pcs HSS Cobalt Titanium Step Drill Bit Set

Powerextra #ad - 50 sizes in 5 pieces step drill bits: the bits set includes five standard step drill bits that can replace 50 individual drill bits and process 50 different kinds of diameter holes, compatibility with 1/4, 3/8 and 1/2 in.

Titanium coating: the titanium coating resists the drill bits from corrosion and rust, copper, stainless steel, deduces friction making it easily to do multiple drills on surfaces such as plastic, aluminum, and other types of sheet metal. Chuck sizes. High quality and widely use: the step drill bits are make by high speed steel, strong and durable can used for stainless steel sheet, aluminum alloy, plastic material and wood. With two-flute design, provides a faster and smoother cutting.

135 degree split point and two-flute design:the drill bit point is designed as X-shape with 135 degree, which can prevent the drill slipping while working in high speed. Automatic center punch & aluminum case: the center punch help you mark the center point that you want to drill, with exquisite aluminum case protects the drill bits not easy to dull and prolongs the drills lifespan.
BrandPowerextra #ad
ManufacturerPowerextra #ad
Height1.5 Inches
Length5.9 Inches
Width5.1 Inches
Part NumberPA-GS6009

8. Senrob


High Speed Steel Titanium Cobalt Bits for Metal, Senrob 5 Pcs Step Drill Bit Set with Automatic Center Punch& Aluminum Case

Senrob #ad - Automatic center punch: center punch with spring inside creates an automatic, high-impact force and the top red cap could save more effort.

Unique shape: straight grooved is for excellent heat dissipation and chip removal, v-type opening design ensures cutting faster and smoother. Wide applications: 50 hole size choices to cut through iron, aluminum, PV and insulating plate as well as other types plates easily. Durable materials: ability of oxidation resistance, no rust and wear, long service life with titanium and cobalt plating coating. Package includes: 5 x step drill bits,1 x automatic center punch,1 x aluminum case.
BrandSenrob #ad
ManufacturerSenrob #ad
Height0.78 Inches
Length3.14 Inches
Weight1.06 Pounds
Width3.14 Inches
Part NumberSDBS5

9. Jerax tools


Jerax tools 1/4 to 1-3/8 Inch Step Drill Bit Spiral Grooved Double Fluted, Wood, Copper, Plastic, M2 High Speed Steel Drill bits for Hole Drilling in Stainless Steel, Aluminum

Jerax tools #ad - Multi hole sizes: no need to buy a kit. M2 hss: cuts a lot more clean holes and much easier than average step bits. Heavy duty: cuts holes on stainless steel, Hardened Metal, wood, Mild steel, galvanized steel, copper, Aluminum, Plastic, or anything that has similar or lower hardness as these materials.

Compared to the straight flutes, making the drilling smoother and creating fewer burrs for the holes. Non-stop: our polished steps and size highlights let you able to see target hole size during drilling. This one step bit comes with 6 marked sizes so you can drill 6 different hole sizes, 1-1/8", 1-1/4", saving you time and effort to change bits. Once you've tried our spiral design, our spiral flutes design cuts EASY, FAST and CLEAN, there's no way back to the straight design. Up to 12ga /2. 7mm thickness for Stainless steel.

Our additional vacuum heat treatment and Nitride surface hardening treatment make the performance even better. Save you time and hassle. Marked sizes including: 1/4", 1-7/32", 7/8", 1-3/8". Easy & fast: with our high-accuracy cnc processing and optimized spiral design over the years, the spiral flutes guide the debris out faster by its nature, outperforming the average ones on the market. In general, m2 has 50% more tungsten and 150% more Molybdenum, both of which are key elements in improving durability.
BrandJerax tools #ad
ManufacturerJerax tools #ad
Height3.55 Inches
Length1.38 Inches
Width1.38 Inches
Part NumberSPG1-3/8



Hss Cobalt Multiple Hole 50 Sizes1/8''-1 3/8'', HYCLAT 5pcs Titanium Step Drill Bit, HTSDB5, High-Speed Metal Steel Step Drill Bit Set with Aluminum Case

HYCLAT #ad - What you get - hyclat step drill, aluminum case or canvas Bag, 24 months warranty - Ideal Gift for Father's Day, Perfect for DIY lover. The step drill bits can work with stainless steel sheets, plastic material, and wood.

Titanium high-speed steel: classic and sturdy high-speed steel with titanium coating for proven capability and durability in drilling holes in plastic, aluminum, copper, stainless steel and many other types of the metal sheet. The protective aluminum case makes the drills not easy to dull. Widely application: the step drill bits can be used to chamfer, aluminum alloy, bur, and drill or enlarge holes. It's can work as 50pcs twist drill bits.

Double cutting blades & three-sided shank - double cutting blades and X-type openings design ensure a faster and smoother cutting; 3-sided shank design prevents slip in drill chuck can cut through the wood, sheet metal, steel, and other surfaces. Features: 5pcs step drill bits enable 50 sizes - each step drill bit can drill several bore diameters. You don't have to replace drill bit constantly for different bore sizes.
BrandHYCLAT #ad
ManufacturerHYCLAT #ad
Weight0.9 Pounds
Part NumberHSS0501