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., #47747, diameter (D) 1-1/4, Type bearing, application 57165, B 5.7mm, D 1/2, 47747 ball bearing guide 1-1/4 dia x 1/2 inner DIA x 5.7mm height