Function: 1 This countersunk drill bit set is made of high quality high speed steel material, sturdy and durable. 2. The surface of the countersunk drill bit is titanium plated to prevent rust, looks beautiful and hard. 3 6-piece countersunk drill bits have 90 degree points to create exquisite and accurate countersunk holes. Suitable for wood, metal, rubber, plastic, etc. 4 Using classic high-speed steel drill bits are extremely durable for drilling in plastic, aluminum, copper, stainless steel and other metal plates. 5 Professional countersunk bits for sinking 90 degree holes into wood and metal countersunk screws and fixtures Specifications: Item Type: Countersunk 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 Uses: Wood, Plywood, Aluminum, Fiberboard, Particleboard, Plastic, etc. PVC board and a variety of other soft Suitable for chamfering a variety of soft materials, such as chamfering quality materials. Package List: