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. 31410083A features a heavy duty sealed radial single-row bearing.This part is Painted Black to prevent rusting. Additional Features: Made of Steel Has two flanges Direct OEM Replacement for: John Deere: AM37249