Feature 1MULTIPLE USAGES: These bits have deep round nose, which are suitable for making small bowls, coin trays, jewel boxes, fishing gear boxes, etc. 2APPLICABLE WOOD: These cove box bits are suitable for processing all types of wood, such as MDF, hardwood, cork and particle board. 38MM SHANK: These woodworking carving bits have standard 8mm shank, and can be stably installed on CNC router, handheld or desktop router. 4TUNGSTEN STEEL ALLOY: These cove box router bits are made of tungsten steel alloy, with high hardness, impact resistance, and wear resistance. 54PCS IN 1 SET: Including 4pcs round nose core box bits, with different specifications to meet more woodworking or DIY processing needs.Item Type: Cove Box BitMaterial: Tungsten Steel AlloySpecification: 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 .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List4 x Cove Box Bits4 x Storage BoxesNoteMake sure to insert at least 3/4 of the shank, especially if it is large.