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. 342000 features a heavy duty sealed radial single-row bearing. Additional Features: Made of Light-Weight Plastic Has two flanges Direct OEM Replacement for: Darman: ZFH3210