Heavy Duty hinges are the Solution for wider, Heavier Doors that the standard duty hinges are not strong enough to Support. Two strategically placed steel pins inside the hinge provide template options, and satisfy two kinds of mounting shower door hinges. For the Safety of”mouse ears” type Cut-outs. The two steel pins should be left in place. This allow the hinges to be used with “Mouse ears” cut-out.The two Pins can be removed,this allows the Shower hinges to be used with square cornered cut-out.