H Style Double Groove Cast Iron Pulley with smooth-surface engineered for rigorous use, long life and minimal maintenance. This is a piece bushing style pulley that includes the H pulley and Tapered H bushing, if ordered. This H Pulley fits the following belt sizes, 3L, A, AK, 4L, 4LK, 3/8" belts and 1/2" belts. Electric motor frame size guide. ...... 5/8" Shaft diameters are found on 56, 56H, 56Y Frame motors ........ 7/8" Shaft diameters are found on 56HZ, 145T, 182Y Frame motors.......... 1-1/8" Shaft diameters are found on 182T and 184T frame motors.......... 1-3/8" Shaft diameters are found on 213T and 215T frame electric motors.