T4A3781 (steel) five knuckle heavy weight bearing full surface hinges are reversible and recommended for use on high frequency and/or heavy weight wood or metal doors in public buildings where there is heavy traffic.
Features
May be used on channel iron frames
Narrow leaf is applied to the surface of the jamb with machine screws, door leaf is applied to the surface of the door with thru bolts and grommet nuts
Heavy weight - for use on all extra heavy and/or high frequency doors
Pin is held in place by an NRP set screw
Reversible
Sits flush with the doors and frames with which they are used