The Surface Mounted. Square Barrel Hinge Set- Right Hand Out Swing and Left Hand In swing are our most heavy duty hinges. They are constructed of 1/8" thick stainless steel. 1-1/2" hole spacing up and down and 2-3/8" right to left hole spacing. Outside dimensions are 3-1/8" wide x 3" high. Also known as Bathroom Stall Gravity Hinge Sets. Manufacture part # 7051. Includes all screws.