1、2 Independent Ball Bearings: This compression spiral router bit features two independent ball bearings with forced steel collars at the tip of each bit to ensure stable and hassle free use. It has a 1/2in shank, 1 5/8in cutting length, and 4 7/32in overall length. 2、Excellent Carbide Material: This compression router bit is made of excellent quality carbide material that meets strict industrial grade quality standards for toughness, abrasion resistance and high cutting performance. The bit stays incisive longer than traditional flat cut trim router bits. Provides better chip removal, less heat buildup and cleaner edges. 3、Nano Blue Coating: This solid carbide trim router bit is coated with Nano blue coating, which has high hardness and heat resistance, keeping the cutting edge of the tool critically incisive and lubricated, and the face of the tool is clean, neat and burr free. 4、Wide Application: This spiral flush trim router bit has a wide range of applications and is perfect for softwood, hardwood, plywood, laminate, OAK, MDF and any hardwood processing. It can be used with table top mounted and handheld routers with 1/2in collets. 5、Stable Running: This compression spiral router bit uses dual ball bearing guides that run according to your guard template to ensure stable running. It works with CNC routers and any drop in router with a 1/2in collet. Item Type: Compression Spiral Router Bit Material: YK20 Carbide Shank: 1/2in / 12.7mm Cutting Lenngth: 1 5/8in / 41.3mm Total Length: 4 7/32in / 107.4mm 1 x Compression Spiral Router Bit 1 x Storage Box