2 blade brass, "Hopkins" prop. 3/16 shear pin size. .450 prop shaft. 5 1/2" diameter. 11 1/2" - 11 3/4" pitch. Prop is in excellent condition. SOmeone put a bushing in it. It is a 9/16 bore with bushing and the ID is .450. There is a welded washer on the back side with 6 splines. Probably was for a KE4 type motor.    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.