Features This countersink drill bit set is made from quality high speed steel material, which is sturdy and durable. The surface of the countersunk drill bits is plated with titanizing to prevent rust, with beautiful appearance and high hardness. 6 piece countersink drill bits have 90 degree point for exquisite and accurate counter sinking. Suitable for wood, metal, rubber, plastic, etc. The drill bits with classic high speed steel is very durable for drilling plastic, aluminum, copper, stainless steel and other metal plates. Professional countersink bits for sinking 90 degree holes into wood and metal countersunk screws and fixings. Specification: Item Type: Countersink Drill Bit Set Material: High Speed Steel 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 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.  Package List: 1 x Center Punch 6 x Countersink Drill Bit Package List 1 x Center Punch 6 x Countersink Drill Bit