Cast Iron 4.5" 2 Groove Dual Belt A Section 4L Pulley With 7/8" Sheave Bushing Masterdrive 2 Piece dual groove 4.5" cast iron pulley/sheave with 7/8" H bushing for A section belts. This is a high-quality 2-piece pulley that measures 4.5" outside diameter and is designed to be used with an H style bushing. This 7/8" 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 will tighten down on the shaft. This style of pulley is much more secure than a standard 1 piece pulley. This listing includes an H bushing to fit on a 7/8" shaft. The bushing itself is made of solid steel and is precision machined to ensure high quality and secure attachment to your motor/engine shaft. This pulley accepts A Section also known as 4L series belts. These belts are 1/2" wide. Specifications: Dual Groove Pulley 7/8" Bushing Included Accepts: A Section / 4L Section Belts High-Quality Cast Iron Construction Solid Steel Bushing For Use on 7/8" Shaft Outside Diameter of Pulley: 4.5"