Carbon steel 70mm copper core plastic handle copper key lock cylinder is not broken, the surface treatment is smooth and smooth, the weight is heavy, the quality is stable, the pig iron is easy to break, only 60 70 is easy to break, but carbon steel starts from 45mm to 120mm.ke customizes the length and specification according to the customer's needs. The customer does not need to worry about the problem of fracture or deformation. Our company specializes in producing lock cylinder with strong strength, high quality and low price. Welcome to visit the company and place an order on the spot. 13646593367.