Check the listing for details. XCAN 2/4 Flutes CNC Spoilboard Surfacing Router Bit 1/2 1/4 Inch Shank. Condition: New. Listed at 41.09 USD. Specification: Type: Insert Router Bit Shank Diameter: 1/2"(12.7mm); 1/4"(6.35mm) Material: High quality carbon steel Hardness of Indexable Insert: HRA95 Material of Indexable Insert: Solid Carbide Delivery Content: 1Pc Router Bit or 10pcs inserts (subject to your choice) Feature: Industrial grade quality: Anti-kickback design, localized hardening treatment for increased hardness and durability. Cost Effictive Inserts: Surfacing router bits utilize 4-sided integral carbide inserts. All 4 edges of the carbide insert can be used and a screwdriver can be used to leave the other edges exposed. Replace the carbide inserts when needed without replacing the entire bit. It is a cost-effective solution compared to brazed router bits and solid carbide spiral bits.