2 blade brass Propeller. 3/16" shear pin size. 9/16" prop shaft size. Diameter is 5 7/8". Pitch is 10. Prop has tremendous amount of cup and also has rear pin mount.    Note:  All pitch sizes are measured at the center of the blade.  All sizes quoted are approximate and may vary slightly.  Sizes quoted, eg, 10 1/2-10 3/4 means the blades are not equal.  All propeller sales are final.  Ask questions first before buying.