This product is a lot of 1/2" and 5/8" fixed bore V-belt pulleys, with 1, 2, and 4 grooves, suitable for various craftsman applications. Made in the United States by ZZ, these pulleys are designed for mechanical power transmission in industrial automation and motion control systems. With a width of 4.100 inches and a length of 4.500 inches, these pulleys provide a reliable and efficient solution for transferring power and motion in machinery and equipment.