【Material】: Cemented carbide woodworking tools, industrial-grade router bits, fully enclosed lubricated bearings, very sturdy and durable, with anti-kickback design. Hardened steel body with anti-kickback function. Teflon coating for heat resistance and construction. 【Dimensions】: This stackable adjustable groove tool comes with 5 blades, a cutting depth of 12.7 mm and an 8 mm shank. Used for CNC routers and other automatic routers and portable tabletop routers. 【Versatility】: Using these tongue and groove tools can improve your hardwood processing performance and create beautiful handmade furniture. Suitable for kitchen and bathroom doors, office furniture, floor tables, bedroom shelves, exterior frames, walls, etc. 【Suitable for】: This groove and slot tool set is truly versatile and practical to use. Suitable for wood, MDF, chipboard, and solid plywood; avoid cutting ferrous metals and other materials, such as steel, iron, sand, etc. 【Important Note】: The cutters must be used one at