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., #47706, diameter (D) 1/2, application our most popular bearing. Fits 1/2" Diameter, B .195 (3/16), D 3/16, 47706 Steel ball bearing guide 1/2 overall DIA x 3/16 inner DIA x 3/16 height