Amana Tool uses only the finest industrial quality precision ball bearings available. Bearings are double steel-shielded for extra rigidity and to inhibit dust. A special high-performance, high-temperature grease is used for maximum life., #47745, diameter (D) 1, type bearing, application 57165, B 5.7mm, D 1/2, 47745 ball bearing guide 1 inch dia X 1/2 inner DIA x 5.7mm height