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 does not come with a bore adapter installed, the inside diameter is equal to the bearing diameter of 17mm. 32600212 features a heavy duty sealed radial single-row bearing.This part is Painted Gray to prevent rusting. Additional Features: Made of Steel No flanges - for use with flat belts