Spetool Solid Carbide Compression Spiral Flush Trim Router Bit 1/2 Inch Shank SPECIFICATION. Compression flush trim Router Bits 1-1/2" cutting length; 1/2" cutting diameter; 1/2" shank; 4" overall length, can be used on routers with 1/2" collect COATING. The new coating provide up to 2.5 times life than the uncoated SHARP EFFICIENT. The flush-trim spiral router bits is sharper and stay sharp longer than conventional flush-trim router bits.provide better chip evacuation, less heat buildup, and cleaner edges SMOOTH STABLE. The router flush trim bit uses a double ball bearing pilot at the tip to run against your project template ensure smooth running WIDE APPLICATION. This flush trim bit can be used for any flush trim situation and is an excellent choice for pattern or template work COMPATIBILITY. The spiral flush trim Router Bits is perfect for soft woods, hard woods, Plywood, laminate, OAK, MDF and any hardwood working. It can be used with table mount and handheld router with 1/4" collet Tips. After each use or continuous processing for half an hour, please removel wood chips covering the flush trim bits to extend tool lifespan