This is the replacement drive washer for the following OS engines:
 .61 SFN-H w/6B carb                      .61 SFN-H ABC w/6B
 .61 SX-H Heli SE                         .61 RX-H Heli RE
 .61 RFN-H RC                             .61 RFN-H ABC RC

PACKAGE INCLUDES:
   1- Drive washer (aluminum)
   1- Woodruff key

SPECS:
   Diameter face: (26mm)
   Inside diameter: (9mm)
   Width: (9mm)