2 blade brass, "Johnson" propeller. 3/16 shear pin size. 9/16 prop shaft size. Diameter is 5 1/4". Pitch is 12 1/2.    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.