Stem Diameter: 8mm; Cutting diameter: 15.9mm; Cutting length: 30mm/ 40mm/ 50mm; Total length: 75mm/ 84mm/ 94mm. Product features: stable precision, fine workmanship, durable rust, clean cut, smooth rotation, fast operation, significantly improved service life. The cutting material has no burrs. PTFE coating: heat-resistant PTFE coating to prevent the accumulation of wood chips, resin and asphalt, good wear resistance , long service life. Solid anti-kickback design: Hardened steel body with anti-kickback balanced design with high quality CNC guide and bearings. Woodworking tools PROFESSIONALS: Perfect for all your large stock trim applications, cuts all composition materials, plywood, hardwoods, and softwoods. Name: Straight Knife Bearing Packing Material: YG8 alloy for cutter head, 45# carbon steel for cutter body, Weight: 58g, 64g, 73g, set of 3 pieces 195g Usage: for wood line grooving, cutting The size of 0.1-0.3 inch size difference is due to the manual measurement within the normal range. The color may vary slightly. slightly due to lights, screens, etc.