General description This AlwaysH 10Pcs Woodworking Twist Drill Bit Set is designed for woodworking and wood carving. It includes rotary burrs that are ideal for grinding, polishing, shaping, and burnishing softwood, plastic, and rubber surfaces. Please note that these tools are not suitable for hardwood. Technical specifications Shank size: 6.3mm Shank type: 1/4 inch Installation Compatible with all drills due to the 1/4 shank size. Usage Perfect for grinding, polishing, shaping, and burnishing softwood, plastic, and rubber surfaces. Other information Manual measurements may allow for a 1-3cm error. Color differences may occur due to lighting and display variations; please refer to the actual item received.