High Speed Steel Step Drills
UNIBIT High Speed Steel Step Drills

High Speed Steel Step Drills

Made In The USA
Item #: 01-906-020
Size Type: Fractional
Size Range: 9/16" to 1"
No. of Holes: 8

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Up to 13 different hole sizes without changing bits


  • Specialty step drill designed to machine a large number of different hole diameters with a single tool.
  • Single cutting edge creates perfectly round holes in metal, plastic, and wood without center punching.
  • For use with thin materials.
  • Two general variations are available for either self-starting holes or for enlarging existing holes.
  • Single flute design helps to ensure perfectly round holes in a wide range of ferrous, non-ferrous and non-metallic materials.


  • Right hand (clockwise rotation) cutting direction.
  • Multi-step design with progressively larger holes.
  • Self-starting or hole enlarging styles.
  • Straight shank diameters of 1/4", 3/8" or 1/2" (6.5mm, 10mm, or 13mm).
  • Conical design permits as many as 13 different size holes to be drilled with one drill.
  • These drills, depending on the model, have a step 1/8" to 3/8" (3.5mm to 11mm) thick between sizes.
  • 20 different models are available to produces holes from 1/8" to 1-3/8" or 4mm to 35mm.
  • The hardened, high speed steel drill body is available in either an uncoated style or with a TiN coating for longer life in tougher materials.
  • M35 grade provides high heat & abrasion resistance.
  • Longest cutting life.
  • 6 times longer life vs. competition.

Technical Data

  • 1/8" to 3/8" (3.5mm to 11mm) step thicknesses.
  • Cylindrically ground from the solid.
  • Bright finish.
UNIBIT HSS Inch Size Hole Enlarging Bit Step Drill
Product Specifications
Size Type Fractional
Size Range 9/16" to 1"
No. of Holes 8
Finish Coating Bright
Model # 20
Drilling Capacity 9/16"to 1"
Flute Shape Straight Flute
Hardness 58 to 60 RC
Manufacturing Method Cylindrically ground
No. of Flutes Single Flute
OC_Steel X
Overall Length N/A
Pilot Hole Required 1/2"
Prop. 65 Yes
Shank Diameter 1/2"
Shank Size 1/2"
Size 9/16" to 1"
Shank Style Straight Shank
Step Thickness 1/8"
Tool Material High Speed Steel
Type High Speed Steel Step Drills
Weight 0.3125 lbs.
Prop 65 Warning Many metalworking products do contain metals that are included in the latest Prop 65 warning. Exposure to the elements can be harmful. May cause cancer and reproductive harm.