This is Du-Bro"s 8mm x 1.25 Aluminum Spinner Prop Nut. FEATURES: Plain silver aluminum spinner. Meets AMA safety specs. CNC machined from 6061 T6 aluminum. Works with standard electric starting cones. This will fit the following engine models: MDS- .61 Morris- .45-.60 Rossi- .40-.90 Saito- 1.20-2.70 Webra- .80-.90 all models YS- all two stroke INCLUDES: (1) Aluminum Prop Nut SPECS: Approx. Weight: 1oz Shaft Size: 8mm x 1.25 COMMENTS: Tighten nut with a screwdriver, ball driver or steel rod. JXR- 8/31/98 ir/jl kr3/17/03