MULTIPLE USAGES: These bits have a deep round nose design, suitable for creating small bowls, coin trays, jewelry boxes, fishing gear boxes, and similar woodworking projects. APPLICABLE WOOD: These cove box bits are suitable for use with various wood types, including MDF, hardwood, cork, and particle board. 8MM SHANK: Features a standard 8mm shank for secure and stable installation on CNC routers, handheld routers, or desktop routers. TUNGSTEN STEEL ALLOY: Constructed from tungsten steel alloy for high hardness, excellent impact resistance, and superior wear resistance. 4PCS IN 1 SET: Includes 4 round nose core box bits in different sizes to meet a variety of woodworking and DIY project requirements. 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 router collet, especially when using larger bits.