This Segal (single cylinder) rim deadlatch is constructed of cast bronze alloy and it comes in a polished brass plated finish. It features a jimmy-proof, spring-loaded shutter guard mechanism, which prohibits forced entry by way of lock picking and tampering. This is a surface-mounted, spring-loaded security-locking device, which can be mounted on 1-3/8 in. to 2-3/8 in. thick, wood or metal doors. This Segal brand deadlatch includes a strike, a rim cylinder, two keys, a cylinder trim ring, fasteners, a mounting plate and installation instructions. This maximum-security deadlatch cylinder is keyed differently. All fasteners and installation instructions are included with this item.