National Hardware Utility Hinge, 43 lb Weight, Door Leaf Width: 2-1/2 in, Door Leaf Thickness: 0.09 in, Frame Leaf Width: 2-1/2 in, Frame Leaf Thickness: 0.09 in, Number of Knuckles: 5, Pin Type: Riveted, Pin Diameter: 0.21 in, Full Mortise Mounting, Number of Mounting Holes: 6, Mounting Hole Diameter: 0.23 in, Hole Spacing: 0.97 in, Steel, Zinc, Dimensions: 2-1/2 in L x 2.61 in W