Item Type: Countersink Drill Bits Set Material: High carbon steel Uses: Suitable for bench drills, hand drills and conventional electric drills. Suitable for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc. Shank Diameter: M6, M5.5, M5, M4.5, M4, M3.5, M3 Wooden Box Material: Compressed wood Package List 7 x Countersink Drill Bit 1 x Wrench 1 x Wooden Box 1EXCELLENT CUTTING PERFORMANCE: Made of classic high carbon steel material with high hardness, possess excellent cutting force and durability 2QUICK 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 3EASY TO USE AND ADJUSTABLE: Hex wrench combination is easy to use and can adjust or remove countersunk bits and five blade chamfers 4UNIVERSAL SHANK DIAMETERS: This set contains 7 different shank diameters for bench, hand and conventional drills, useful and practical 5FOR VARIOUS MATERIAL: Countersink drill bits are suitable for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber and other materials