Step Drill Bit Set Set 1/4"-3/4" 1/8"-1/2" 3/16"-1/2" HSS 4241 Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic Dark Gray The screw holes are designed

The screw holes are designed as countersunk holes

Inner  Diameter: 41

Total Length: 420mm / 16

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40 Pcs x M3 Screws

Step Drill Bit Set Set 1/4"-3/4" 1/8"-1/2" 3/16"-1/2" HSS 4241 Titanium Coated Straight Flutes Hex Shank for Metal Wood Plastic Dark Gray The screw holes are designedFeatures: Laser marking makes the size more clear; Used on electric drills and drill presses; Double cutting edges design enables a faster and smoother cutting; Hexagonal shank prevents slip in electric drills and presses chuck; X type openings design to facilitate the removal of cutting waste when drilling; The sharpness and titanium coating ensure easily cut through most metal, aluminum, plastic, wood and other materials with ease; Specifications: