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 panels, medium density fiberboard, particle board, plywood compact panels, 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, trimming, grooving, refining wood projects and ideal for woodworkers and hobbyists of all experience levels. Knife handle diameter: 6 mm. Includes 7 different sizes of groove cutters that meet the basic needs of grooving in woodworking. (Please pay attention to size and suitability before Note: The data are all manual measurements, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain color difference, whichever is the actual physical object received.