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4PCS -- The drill bit set include 4pcs HSS constructed drill bits for drilling holes with screw sizes #6 2.38mm, #8 2.78mm,#10 3.175mm, #12 3.56mm.
PREMIUM MATERIAL -- This drill bit set are made of high quality HSS 4241 material, very and can serve you for a long time.
WIDE RANGE OF USAGE -- Suitable for drilling workpiece with the hardness below 25HRC, such as for carbon steel, sheet iron.plate, insulating plate, PVC plate, wood board, etc. Use on a drill machine with chuck or connector.
6.35mm Standard hex shank is fast change compatible.
Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew.