Cast Iron 4" Two Groove B Section Pulley with 1" Bushing Brand new dual groove 4" cast iron, 2 pc. pulley/sheave with 1" H bushing for B section belt. This is a high quality 2 piece pulley that measures 4" 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 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 1" shaft, you can purchase different bushings if you need this for a different shaft size. The bushing itself is made of solid steel and is precision machined to ensure a high quality and secure attachment to your motor/engine shaft. This pulley accepts B Section also known as 5L series belts. These belts are 5/8" wide. This pulley will work with A Section belts Also known as 4L; however, they will sit farther down in the groove which will reduce your pulley size by 1/4" to 1/2" on average, depending on the size of pulley. Specifications: Dual Groove Pulley 1" Bushing Included Accepts: B Section / 5L Section Belts High-Quality Cast Iron Construction Solid Steel Bushing For Use on 1" Shaft Outside Diameter of Pulley: 4"