Router, Planer Accessories -Root Carving Router Bits Highlights Generic Brand Root Carving Router Bits Description: Industrial grade micro grain carbide ball bearing blades, anti-kickback design to control depth of cut and work safely For wood carving, root carving, tea table making Relatively thin, best suited for metal/non-metal workpieces with high surface finish Suitable for most rotary tools. Can be installed on electric drills, grinders and electric grinders. Size: rod diameter: 4pcs/6mm; Rod Length: 95mm/93mm/90mm/89mm; Ball Diameter: 22mm/20mm/18mm/16mm Specification: Material: Alloy Steel Shape: Spherical Stem: 6mm Stem Length: 95mm/93mm/90mm/89mm Ball Diameter: 95mm/93mm/90mm/89mm ball: 22mm/20mm/18mm/16mm Package includes: 4 pieces of blade ball woodworking router