This is Du-Bro's 8mm x 1.25 Anodized Aluminum Spinner Prop Nut.
FEATURES: Gold anodized aluminum spinner
Meets AMA safety specs
CNC machined from 6061 T6 aluminum
Works with standard electric starting cones
Designed to fit engines with a 8mm x 1.25 threaded crankshaft
including the following listed below
MDS- .61
Morris- .45-.60
Rossi- .40-.90
Saito- 1.20-2.70
Webra- .80-.90 all models YS- all two stroke
INCLUDES: (1) Anodized Aluminum Prop Nut
SPECS: Approx. Weight: 1oz
Shaft Size: 8mm x 1.25
Diameter: 1.25" (32mm) at the widest point
Length: 1.2" (30mm)