Incisive Cutting Edge: With incisive cutting edge, these bottom cleaning drill bits can improve working efficiency and product quality 6mm Diameter Shank: Designed with 6mm diameter shank, these bottom cleaning drill bits are suitable for most machines Suitable For: These router bits can generally be used on wood routers or CNC engraving machines for woodworking, inserting a wide range of materials, including wood, MDF, PVC High Hardness: Made of tungsten carbide steel, these bottom cleaning drill bits have high hardness and long service life