Check the listing for details. Chicago Die Cast 300A Pulley 5/8" Bore 3" Diameter A Belt. Condition: New. Listed at 12.50 USD. The Chicago Die Cast 300A Pulley is a durable and high-quality pulley designed for industrial automation and motion control systems. With a 5/8" bore size and a 3" diameter, this pulley can efficiently transmit mechanical power and support heavy loads. Its sturdy construction ensures long-lasting performance in various industrial applications. The A Belt section suggests that it is compatible with a specific belt type, providing a reliable and efficient power transmission solution for your machinery or equipment.