Chicago Die Casting 5/8" Bore x 1-3/4" Diameter Single V-Groove Die Cast Pulley is 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 durable die-cast material. This pulley is ideal for a variety of applications and is available in a convenient Sta-Pak carton.