Bolt on Stake Pocket for trailers and trucks, Zinc coated, Heavy duty 14 gauge steelFits 2×4 without modification, slides right into opening, with bottom supportEasy to install you only need to drill two holes, has a loose fit so no modification is neededSquare holes works with ⅜” carriage bolts, and regular ⅜ bolts with 5” mounting hole spacingHas rounded corners unlike others with sharp rigid corners that can cut you