Hinge: 4 Ball Bearing w Non Removable Pin; Pair. Comes in an array of fine lifetime finish. Maintain a superior finish due to its ability to resist oxidation. Solid brass. Corners: Square. Thickness: 0.134 in.. Machine screw: No.12 x 0.5 in.. Wood screw: No.12 x 1.25 in.. 4.5 in. L x 4.5 in. W.