Maximum Power Delivery: Delivers extra power to push through heavy vegetation, wind, and current for improved boat control 3-1/4" Motor Fit: Fits 3-1/4 inch motor diameters for motors up to 35 lb thrust in compact motor range Rugged Construction: Made from rugged impact-resistant composite material for dependable performance and long service life Complete Hardware Included: Includes prop pin, nut, and washer for complete installation without additional purchases Efficient Design: Balances speed and power without excess battery draw for extended run time on the water