This V-Groove Idler Pulley works both as an OEM replacement and as a general purpose pulley for power transmission such as compressors, industrial fans, lawn mowers, snowblowers, and electric motors. It comes with a bore adapter to bush down from 17mm to 3/8'' inside diameter. 35500038A features a heavy duty sealed radial single-row bearing.This part is Zinc-coated for long-term rust prevention. Additional Features: Made of Steel Works with 3L|4L/A|5L/B belts Direct OEM Replacement for: Ferris: 5103456