This Flat Idler Pulley is for use as a general purpose pulley for power transmission such as compressors, industrial fans, lawnmowers, snowblowers and electrical motors. It will not require any bore adapter or bushing for use. 313423175 features a light duty radial sealed double-row bearing, and will have no need for a bushing. This part is Painted Black to prevent rusting. Additional Features: Made of Steel Flanges angled outward to help increase belt life