8.25" Double Groove A Section 4L Sheave with 1-3/8" (1.375") H-Style Split Taper Bushing - 2AK84HCast Iron 8. 25" Dual Groove Belt A Section 4L Pulley w 1 3 8" Sheave Bushing Masterdrive dual groove 8. 25" cast iron pulley sheave with 1 3 8" H bushing for A section belt is a high quality 2 piece pulley that measures 8. 25" outside diameter and is designed to be used with an H style bushing. This bushing inserts into the center of the pulley and slides over the shaft, as you tighten down the bolts on the H bushing it will tighten down on the