The Industrial back plate is used with 434 series industrial strap hinges when bolting them to a non-reinforced door. The 434 industrial back plate comes in four variations which correspond with the four available lengths of hinge. The back plate distributes the force of the fasteners over a larger surface thereby preventing damage to the door. The industrial back plate is made from steel and finished with a powder coat. Back plate dimensions: 16-1/2″ x 2-1/2″ x 3/16″. Fasteners not included.