Triple Row Roller Slewing Bearing Ring for Port Crane

How do you find the Triple Row Roller Slewing Bearing Ring for Port Crane specification? Manufacturers Online 20 Bore Diameter (mm) Free metal with bronze and graphite Bearing Type check！ Bore Diameter (mm) 20 Outer Diameter (mm) 23 Bearing Type metal with bronze and graphite Shaft Dia., Nominal (d) 20.0000 Shaft Size (ds) – 20