Usage Tips:Description: Adopting stainless steel material, this drill bit is sturdy, rust-proof, corrosion-resistant, wear resistant and not easy to deform and break. This drill bit is practical, which can efficiently drill countersinks to help create strong joints between screw and the workpieces surface. Featuring five-flute design, this drill bit can reduce vibration for smoother drilling. It is constructed of high speed steel material. This set contains all commonly used sizes Including 6mm, 8mm, 9mm, 12mm, 16mm, 19mm. The diameter is 6.35mm. The length of this product is 50mm. Suitable for low hardness sheet, such as wood, plastic and other soft materials. Cannot be used with metals. Perfect for home or factory woodworking, etc. Item Name: Chamferer Bit Material: High Speed Steel Handle Diameter: 1/4 Inch (6.35mm) Drilling Specifications: 6mm, 8mm, 9mm, 12mm, 16mm, 19mm Features: High Hardness, Sharp, Multi-sizes Size Details: Diameter: 6.35mm/0.25"(Approx.) Length: 50mm/1.97"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. How to Use: 1. Drill a hole according to the width of the screw. 2. Select an appropriate countersink drill to create a hole to fit the width of the screw. 3. The top of the screw is perfectly flat with the surface. Package Includes: 6 x Chamferer Bits