7 types of cutter heads for different applications, to meet a variety of cutting needs. Premium Material Made of strong hardened steel, durable. High precision and great solidity. High Quality and Heavy Duty - Industrial grade router bits, high quality carbide cutter with brazing for maximum strength. Product Features Stable precision, fine workmanship, durable rust, clean cut, smooth rotation, fast operation, improvement significant to the lifespan. The cutting material has no burrs. Size Shank Diameter：About 8mm. High strength; Head diameter: 6mm, 8mm, 10mm, 12mm, 14mm, 18mm, 20mm. Professional woodworking tools 7 kinds of cutter heads for different applications, to meet a variety of cutting needs. Mainly used for cutting and smoothing a variety of materials such as wood, plywood, MDF and other wood composite materials, etc. Note: The data is all manually measured, please allow 1 error at 3cm, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.