Harbor Freight Tools


#3 1/4 in. - 3/4 in. Black Oxide Step Bit

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BAUER™ black oxide #3 step bit has 2x longer life* and drills holes in 9 different sizes up to 3/4 in. in metal, wood and plastic

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This BAUER™ step drill bit in constructed with premium high speed steel with black oxide coating to prevent rust and corrosion and provide up to 2x longer life* than standard high speed steel. The step bit automatically deburr holes as you drill and the two-flute design provides faster, smoother cutting. Whether drilling in plastic, metal or wood, this step bit cuts great every time.

  • Dual flute design cutting edges for greater control and rounder holes
  • Black oxide coating for enhanced durability and performance
  • Automatically deburrs holes while drilling

Important Information

  • * Based on stated specifications of our standard product

64666, 64665, 64667
Black oxide
M2 Steel
Maximum Diameter
3/4 in.
Minimum Diameter
1/4 in.
Shipping Weight
0.18 lb.
#3 - 9 Laser Engraved Hole Sizes: 1/4 in., 5/16 in., 3/8 in. 7/16 in., 1/2 in., 9/16 in., 5/8 in., 11/16 in., 3/4 in.
Shank size
1/4 in.
CA Residents
Warning - Prop 65 Info
Note: Specifications are approximate and subject to change

We guarantee this product to be free from defects in materials and workmanship 90 days from the date of purchase. Limitations apply.