A high-speed cutter with teeth made of tungsten carbide, the hardest material next to diamonds. Fast-cutting sharp teeth for greater material removal. Use on fiberglass, wood, plastic, epoxy, rubber, laminates, particleboard and ceramic tile. Use on fiberglass, wood, plastic, epoxy, rubber, laminates, particleboard and ceramic tile Teeth made of tungsten carbide, the hardest material next to diamonds Sharp teeth for greater material removal Fast cutting BIT DIAMETER INCH: 5/16" BIT DIAMETER MM: 7.9 mm