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EASY TO USE AND ADJUSTABLE: Hex wrench combination is easy to use and can adjust or remove countersunk bits and five blade chamfers

EXCELLENT CUTTING PERFORMANCE: Made of classic high carbon steel material with high hardness, possess excellent cutting force and durability

UNIVERSAL SHANK DIAMETERS: This set contains 7 different shank diameters for bench, hand and conventional drills, useful and practical. Shank diameter: M6, M5.5, M5, M4.5, M4, M3.5, M3

FOR VARIOUS MATERIAL: Countersink drill bits are suitable for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber and other materials

QUICK AND ACCURATE DRILL: Drill smooth holes quickly and accurately, possess better centering and slip resistance. The five edge chamfering design automatically and quickly discharges the chips in the holes on both sides