5831 ball lock: 1. we are the manufactory of locks . 2. ball size : 53 mm 3.plate size :74 mm 4. tongue :zinc alloy 5.3iron keys . 6.core:copper core. 7.lock body weight :440 g 8. material of lock body :stainless steel 9.Suit door thickness :35-45 mm 10.OEM and ODM are welcomed 11. good quality