Cast Iron 5.75" Single Groove V Style A Belt 4L for 5/8" Shaft Pulley Sheave Masterdrive single groove 5.75" pulley for A Section / 4L belts. This is a high-quality cast iron pulley. This pulley is designed to fit a 5/8" keyed shaft and features dual set screws to ensure a completely secure fitting. Most pulleys that are similar to this only have one set screw, making them less reliable in many working conditions. This pulley is designed to be used with A Belts (also known as 4L Belts). Specifications: Fits 5/8" Shaft 5.75" Diameter Features Dual Set Screws Solid Cast Iron Construction Secure Reliable Performance Accepts A Belt Also Known As 4L