Stalwart 75-1170 Hawk 170-Piece Sheet Metal U-Clip and Screw Assortment, 5 Sizes 170-Piece Sheet Metal U-Clip and Screw Assortment - 5 Sizes Essential hardware set for use with sheet metal or other thin material Screw threads through u-clip for strong holding power Galvanized steel screws, black-oxide clips for rust and corrosion resistance U-clips and matching screws in the five most commonly-used sizes