This V-Groove Drive Pulley is for use as a general purpose pulley for power transmission such as compressors, industrial fans, lawnmowers, snowblowers and electrical motors. It has a hub attached and the inside diameter is 1/2''. This pulley comes with 1 set screw holes. This part is Zinc-plated or Painted to prevent rust. Additional Features: Made of Steel Works with 4L/A belts