3-1/2", Zinc, #287 Gate Hinge, Designed For Applications With Narrow Mounting Surfaces, Such As Gates, Barn & Shed Doors, Storage Bins & Toll Boxes, Designed For 2 x 4 Or 4 x 4 Post Applications, Tight Pin Allows Right Or Left Hand Applications, Hinge Is Made Of Heavy Duty Material, Designed For Full Or Half Surface Applications.