The Three Knuckle Institutional Prison Hinge by Hager Companies ensures the security of correctional environments. Both the hinge and pin are constructed of welded stainless steel, with a concealed, maintenance-free bearing. Additional product options include security torx screws, electric monitor (EMN), electric through wire (ETW), electric through wire and monitor (ETM), reverse safety stud (RSS) and safety stud (SS). The Hager Three Knuckle Institutional Prison Hinge is best used on heavyweight doors ranging from 200 pounds to 300 pounds, and is available in LS, USP and US26D finishes. Hager also offers a heavyweight, full mortise hinge with concealed bearings, a full-surface heavyweight utility hinge, and a full-surface heavy-weight pass through hinge with stop. Several size options are available.