This is the Rear Bearing for the O.S. Engines GT55 Gasoline Engine (OSMG1555). FEATURES: This bearing is made of hardened steel It is an open bearing (not sealed) INCLUDES: One rear crankshaft bearing part #19 in engine part list SPECS: Inside Diameter: 25mm (0.98") Outside Diameter: 47mm (1.85") Thickness: 8mm (0.31") lmm 04.13.10 ir/jxs