This 100% weedless prop features a unique, patented design with swept-back and flared blades that “wedge” weeds away while conserving battery power. It helps you move through heavy vegetation – even at slow speeds. Includes prop nut, pin and washer. Fits 4-1/2” lower unit diameter. For use with 1” x 3/16” prop/drive pin. Prop nut thread: 3/8”-24. MKP-38.