Specifically engineered, this Trend bearing has a 1/4 inch bore and a 30 mm diameter, precisely crafted for compatibility with professional router cutters, ensuring maximum performance. The bearing is shielded to block dust and is packed with grease for its lifetime, eliminating the need for solvent cleaning or further lubrication. Any resin build-up can be effortlessly scraped off to maintain the bearing's efficiency and to avoid unnecessary deterioration. Always ensure the fixing screw's tightness before using the cutter, for a safe and optimal operation. As a part of the Professional Router Cutters series, this bearing serves as a dependable replacement, restoring your cutter's peak performance. Weight: 0.03 Pounds, Manufacturer: Trend.