4.75" Double Groove B Section 5L Sheave with 1-1/4" (1.250") H-Style Split Taper Bushing - 2BK50HCast Iron 4. 75" 2 Groove Dual Belt B Section 5L Pulley w 1 1 4" Sheave Bushing Masterdrive dual groove 4. 75" cast iron pulley and sheave combo with a 1 1 4" H bushing for B section belt. This is a high quality pulley that measures 4. 75" outside diameter and is designed to be used with an H style bushing. This 1 1 4" bushing (Included) inserts into the center of the pulley and slides over the shaft. As you tighten down the bolts on the H bushing it