This insert ball bearing carries radial loads through a cylindrical outer ring and transfers torque to the shaft via an eccentric locking collar, giving secure axial fixation without additional clamping elements. Bore diameter is 50.0 mm, outside diameter 90.0 mm, width 49.2 mm, and net mass 1.0 kg. The design designation KRR indicates R seals fitted on both sides of the bearing. The eccentric locking collar allows quick mounting directly on plain shafting and keeps the inner ring positioned axially once tightened, which suits applications where the shaft itself is not stepped or threaded for other locking methods. The two-sided R sealing keeps grease in and contaminants out, so the bearing is suited to installations where re-lubrication access is limited and where a self-contained, sealed unit is preferred over an open bearing requiring external sealing arrangements.