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''. This pulley comes with 1 set screw holes. The heavy duty steel is designed to be more durable. This part is Painted Black to prevent rusting. Additional Features: Made of Steel Works with 5L/B belts