Material: tungsten carbide, superior abrasion resistance; steel bits that meet the high demands of woodworking and hardware. Size: 6mm shank; cutting diameter: 16mm/22mm/25mm/32mm. Universal: The box drill bit is designed for reed, flute, panel making and round nose groove. Feature: Use on CNC and other automatic routers as well as handheld and portable routers. table mounted; it is especially effective for flat surfaces. This bit allows you to cut dovetail joints to match the precision and precision of drawers and furniture. Note: the data are all manual measurement, please allow 1 - 3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.