This Flat 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 does not come with a bore adapter installed, the inside diameter is equal to the bearing diameter of 17mm. 343254 features a heavy duty sealed radial single-row bearing. Additional Features: Made of Light-Weight Plastic Flanges angled outward to help increase belt life Direct OEM Replacement for: Turf Teq: 10-0501