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 3/4''. There are no set screw holes. This part is Powdercoated for long-term rust prevention. Additional Features: Made of Heavy-Duty Cast Iron Works with 4L/A belts