【Material】: Cemented carbide woodworking tools, industrial grade cutters, fully enclosed lubricated bearings, very sturdy and durable, with anti-backoff design. Hardened steel body with anti-kickback function. Teflon coating for heat and construction resistance. 【Size】: This stackable adjustable grooving tool is equipped with 5 blades, a cutting depth of 12.7 mm and an 8 mm handle. Used for CNC routers and other automatic routers and desktop portable routers. 【Versatility】: Using these tongue and groove tools can improve your hardwood processing performance and make beautiful handmade furniture yourself. Suitable for kitchen and bathroom doors, office cabinets, floor tables, bedroom shelves, exterior frames, walls, etc. 【Suitable for】: This set of slotting and grooving tools is really versatile and practical to use. Suitable for wood, MDF, particle board, compact plywood; please avoid cutting ferrous metals and other materials, such as steel, iron, sand, etc. 【Important note】: The