Qingdao Yizhaoyuan Ship Fittings Co., Ltd. is professional boat propeller manufacturer which specializes in aluminum propellers,stainless steel propellers,nibral propellers and jet ski impellers. With many years manufacturing experience, we has created well-kown brand "POLY-DA".Polyda propeller has been distributed to 60 countries and regions in the world and recognized by more and more customers.PolyDa propeller has strict quality control system to ensure every propeller which received by customers is qualified.Quality consiousness is instilled from raw material processing to final packing.Quality inspection is carried out during Casting process,Maching Center,Painting and Packing for every propeller with series of analysis equipment to assist the inspection such as Salt Spray Testing Machine,CMM Systems,Rubber Torque Tester, Hardness Tester and Dynamic Balance Machine.We are constantly improving process and striving even higher. Our Motto is "Keeping Improving".We sincerely expect your kind cooperation. Best Wishes.