Bore Size: 30-60mm Outster: 52.5-149mm Precision Rating: P0 P6 P5 P4 P2 Seals Type: Open of Row: Single Row Structure:: Roller Bore Size:: 30-80mm Precision Rating:: P0 P6 P5 P4 P2 Sample:: available Material:: Chrome steel Outster:: 52.5-185mm Certification:: ISO9001: 2008 Brand Name:: MBY Model : Combined Track Roller Bearing W-4.054 OEM: Acceptable