The router bits made of YG8 carbide alloy and 45 carbon steel. These YG8 carbide alloy cutters are more suitable for rough machining of wood products at low speeds. The heat-resistant green coating of the groove cutter set prevents the accumulation of sawdust, resin and asphalt and improves your work efficiency. Please take good protective measures during operation to prevent wood chips from damaging your eyes. Suitable for wood panel, medium density fiberboard, particle board, compact wood board plywood, etc Do not cut ferrous metals and non-wood materials, such as: steel, iron, sand, etc. These router bits are perfect for woodworking, for edging, cutting, trimming, grooves, for refining woodworking projects and ideal for woodworkers and hobbyists of experience levels. Knife Handle Diameter: 6mm. Includes 7 different sized slotting cutters that meet basic slotting needs in woodworking. (Please pay attention to the size and fit before purchasing)