Qingdao Choho has world-class production and manufacturing equipments such as high-speed punching machine, continuous heat treatment mesh belt furnace, high-precision wire cutting machine, coordinate grinder, shot blasting machine, high-speed pipe pin cutting machine, automatic chain assembly line and ultrasonic automatic cleaning and hot dipping line, etc., which form a professional large-scale, high-quality and stable production mode. With conventional testing instruments such as metallographic, laboratory, chain length, tensile strength, hardness, spark, twist, press-out force and other performance testing equipments such as wear-resistant experiment and high-speed fatigue testing machine, we make every chain and chain parts undergo rigorous quality testing to ensure that every chain we sell is of reliable and excellent quality.