Hinge reinforcement plates are use when existing door hinge mounting is missing, damaged or new hinge installation is required. Different plates available that can be attached with screws, welding, or rivets to the inside of metal doors or frames.

Hinge shims are use to correct miss aligned doors. They can be use to move the door toward or away from the latch side.

Also see: How to install hinge shims and How to fix door sag.