Shenzhen Changen Industry Co., Ltd. was established in 2002. Located in Shenzhen, and there are 200 employees. The workshop and factory buildings cover 15000 square meters. CEI is specialized in designing and producing top security products, such as lock cylinders, lock cases, steel wooden security doors, wooden doors and other hardware. CEI has passed ISO9001 certification. Our products are AAA certified and named as green products. Our company has our own brand of CEI. The products ...   |