Item Type: Countersink Drill Bit Set_x000D_ Material: High Speed Steel_x000D_ Drill Bit Size: Approx. 6.3mm / 0.24in, 8.3mm / 0.32in, 10.4mm / 0.4in, 12.4mm / 0.48in, 16.5mm / 0.64in, 20.5mm / 0.8in_x000D_ Product Use: Very Suitable for Wood Drilling, Reaming, Chamfering, Screw Heads, Etc., Suitable for Chamfering Various Soft Materials Such As Wood, Plywood, Aluminum, Fiberboard, Particle Board, Plastic, PVC Board and Other Various Soft Material Chamfers. 1This countersink drill bit set is made from quality high speed steel material, which is sturdy and durable. 2The surface of the countersunk drill bits is plated with titanizing to prevent rust, with beautiful appearance and high hardness. 36 piece countersink drill bits have 90 degree point for exquisite and accurate counter sinking. Suitable for wood, metal, rubber, plastic, etc. 4The drill bits with classic high speed steel is very durable for drilling plastic, aluminum, copper, stainless steel and other metal plates. 5Professional countersink bits for sinking 90 degree holes into wood and metal countersunk screws and fixings.1 x Center Punch 6 xCountersink Drill Bit