Large 70mm steel casing zinc core inner door lock cylinder, with 5 computer keys, surface treatment chromium, you can order other models and specifications according to customer needs, different materials and keys, different configurations, the company also has more products introduced one by one. Different materials of steel, copper, iron and zinc alloy are mainly used as products, which are optional for single opening and double opening. The company has strong strength, high quality and low price, and strives for survival based on quality, seeking development by variety and pursuing the principle of mutual benefit develop steadily. Welcome to the company for on-the-spot investigation.