This is a replacement O.S. Engines Rear Ball Bearing, and is intended for use with the O.S. 91HZ-PS Helicopter Engine.
Inside Diameter: 17mm
Outside Diameter: 35mm
This Part Is Compatible With The Following O.S. Engines
NOTE: This part may be compatible with other O.S. engines. Please check your owner's manual and cross reference the part number to verify that this is the correct part for your engine.