1、Applicable Model: The propeller nut kit is for outboard engine 30HP to 60HP. Please confirm whether it is consistent with the product you want before buying to avoid unnecessary return. 2、OE Number: The part numbers for reference are 66T‑W4599‑00, 66T‑W4599‑00‑00, 66T‑W4599, 66T‑45997‑00, 90389‑22M01, 663‑45987‑02, 90171‑16011, 91490‑30025. 3、Sturdy Metal Construction: The marine propeller nut kit is made from rust proof metal that can withstand marine environments, resistant to oxidation and wear, ensuring long lasting use. 4、Reliable Performance: With this hardware nut kit, you can ensure optimal propeller use, maximizing your boat's speed and fuel efficiency, enhancing overall performance. 5、Easy Installation: This outboard propeller nut installation kit is designed for simple installation. You can set up and secure your propeller in no time.