Chicago Die Casting 3/4" Bore x 8" Diameter Single V-Groove Die Cast Pulley is used for a variety of applications. It is made of die cast metal and has a single V-groove for use with 4L or 1/2" x 11/32" belts. The pulley has a hollow head set screw for easy installation and removal. For A belts, pulleys from 2 inch to 12 inch have keyways except 3/8 inch and 1/2 inch bores and 3/4 inch bores in pulleys less than 4 inch in diameter. All pulleys are with slotted headless set screws.