High security lock, EN 1300 certified Double-bitted key with special profile Key-retaining lock in open position. Nickel-plated rotating steel bolts ø 22mm. Lock mechanism protected by a manganese-steel plate. Horizontal and top vertical bolts protected by drill resistant manganese-steel plate 3mm thick Special door battens for exceptional resistance against robbery attempts using a sledge hammer. Internally welded by a robot-controlled system. Front panel seam-welded to the casing by a robot-controlled system. Removable internal shelf. Base and back fixing holes. Screw anchor fixing bolts provided.