Chicago Die Casting 1/2" Bore x 3" Diameter Single V-Groove Die Cast Pulley is designed for use with 4L or 1/2" x 11/32" belts. It features a hollow head set screw for secure attachment and is made of zinc for long-lasting performance. With an outside diameter of 3 inches, a bore diameter of 1/2 inch, a face width of 11/16 inch, a pitch diameter of 2-3/4 inch, and a keyway size of 3/16 x 3/32 inch, this pulley is ideal for a variety of applications. It comes with hollow head set screws for easy installation and is packaged in Sta-Pak cartons for convenient storage and handling.