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., #47719, diameter (D) 7/8, application 49340, B .196 (3/16), D 3/16, 47719 Steel ball bearing guide 7/8 overall DIA x 3/16 inner DIA x 3/16 height