Features MULTIPLE USAGES --- These bits have deep round nose, which are suitable for making small bowls, coin trays, jewel boxes, fishing gear boxes, etc. APPLICABLE WOOD --- These cove box bits are suitable for processing all types of wood, such as MDF, hardwood, cork and particle board. 8MM SHANK --- These woodworking carving bits have standard 8mm shank, and can be stably installed on CNC router, handheld or desktop router. TUNGSTEN STEEL ALLOY --- These cove box router bits are made of tungsten steel alloy, with high hardness, impact resistance, and wear resistance. 4PCS IN 1 SET --- Including 4pcs round nose core box bits, with different specifications to meet more woodworking or DIY processing needs. Specification: Item Type: Cove Box Bit Material: Tungsten Steel Alloy Specification: 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:Make sure to insert at least 3/4 of the shank, especially if it is large. Package List 4 x Cove Box Bits 4 x Storage Boxes