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. This pulley comes with 2 set screw holes. The heavy duty steel is designed to be more durable. This part is Zinc-plated or Painted to prevent rust. Additional Features: Made of Steel Works with 4L/A|5L/B belts Heavy duty split steel