Electric Italian Iron Door Latch Lock: It is manufactured in Italy and installed behind the door using a latch mechanism powered by a 12-15 volt electrical transformer.
"Palmera concealed lock with a double-sided key cylinder. It features a stainless steel face resistant to rust, a 70mm brass cylinder core, and a brass key.
Concealed security lock for external doors: Excellent quality, four-digit combination, 45mm size, double-sided key cylinder with a brass core, and comes with three brass keys
Yale electric concealed lock: 50mm size, operates on 12 volts - 15 watts electrical power, used for iron and wooden doors, and works with the intercom system.