Check the listing for details. FAFNIR 010 10874- IDLER PULLEY, 0.635/0.64" BORE, SOME RUST. Condition: New – Open box. Listed at 17.50 USD. This FAFNIR 010 10874 Idler Pulley has a bore size of 0.635/0.64 inches and shows some rust. It can be used in various applications including ball and roller bearings, mechanical power transmission, and industrial automation and motion controls. The brand of this idler pulley is FAFNIR, known for producing reliable and high-quality products. This idler pulley can help improve the efficiency and performance of your machinery. Its durable construction and accurate measurements ensure proper fit and function. The rust on the surface does not affect its functionality, and it remains a cost-effective solution for replacing worn out or damaged idler pulleys. Invest in this FAFNIR 010 10874 Idler Pulley and experience its benefits for yourself.