This is a Rear Crankshaft Ball Bearing for the following Engines: 25F ABC #12630 32F #12920 32SX #12970 25FSR #12615 32F-H #12900 32SX-H #12950 28F #12710 32F-HS #12910 32SX-H Ring #12956 28F-H #12700 32F-HX #12930 32SX-HX Ring #12960 28F-H ABC #12704 32F-MX #12940 21RG #13610 21RG(P) #13611 21RG(P)-X #13612 FEATURES: This is an Unshielded Bearing with the Bearing Cages Showing. INCLUDES: One Rear Ball Bearing SPECS: Inner Diameter: 12mm Outer Diameter: 24mm Thickness: 6mm COMMENTS: This has a phenolic retainer. The incorrect belief is that it has a ceramic retainer - it does not. This Bearing Replaces the 22630002 Ball Bearing. gab2/23/95 ir/jl