The FAFNIR 1" 4 Bolt Flange Mount Bearing RCJ-1 is a high-quality ball and roller bearing designed for industrial automation and motion control applications. This bearing is a new old stock item, indicating it has been in storage for a while but is still in brand new condition. With a 1" diameter and 4 bolts for mounting, this bearing is durable and reliable for various mechanical power transmission needs. The FAFNIR brand is known for producing top-notch bearings and bushings for a wide range of industrial sectors.