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. The bushing is made of solid steel and precision machined to ensure high quality and secure attachment to your motor/engine shaft. Masterdrive 3.5 2 Piece dual groove cast iron pulley/sheave with 1-3/8 H bushing for A section belts. This is a high-quality 2-piece pulley... Cast Iron 6 Dual Groove Belt A Section 4L Pulley w/ 7/8 Sheave Bushing Masterdrive dual groove 6 cast iron pulley/sheave with 7/8 H bushing for A section belt is a high-quality 2-piece pulley that measures 6 outside diameter and is designed to be used with an H style bushing. This pulley accepts A Section also known as 4L series belts and is 1/2 wide. 2AK46H 5/8 Bore Solid Sheave Pulley with 4.6 OD Double Groove Pulley Rrx 2ak61h Cast Iron 4.75" Dual Groove Belt A Section 4L Pulley W/ 3/4" Sheave V Belt Measuring Tool Outside Diameter of Pulley: 6 Vehicle Fitment -- Compatible with Chevy Avalanche 2007-2013, Sububan 1500 2007-2014, Silveado 1500 2005-2013, Silveado 1500 Classic 2007, Tahoe 2007-2014, Tailblaze 2005-2008, 5.3L This style of pulley is much more secure than a standard single-piece pulley.
