MULTIPLE USAGES: These bits have a deep round nose, suitable for making small bowls, coin trays, jewelry boxes, fishing gear boxes, and other woodworking projects. APPLICABLE WOOD: These cove box bits work well with various wood types, including MDF, hardwood, cork, and particle board. 8MM SHANK: Features a standard 8mm shank that fits securely in CNC routers, handheld routers, and desktop routers for stable performance. TUNGSTEN STEEL ALLOY: Made from tungsten steel alloy for high hardness, durability, impact resistance, and wear resistance. 4PCS IN 1 SET: Includes 4 round nose core box bits in different sizes to meet a variety of woodworking and DIY needs. Item Type: Cove Box Bit Material: Tungsten Steel Alloy Specifications: 8 x 1/4 x 25.4, 8 x 5/16 x 25.4, 8 x 3/8 x 25.4, 8 x 1/2 x 25.4 Package List: 4 x Cove Box Bits 4 x Storage Boxes Note: Ensure at least 3/4 of the shank is inserted into the collet, especially when using larger bits.