Simpson Strong-Tie 15/32 In. Galvanized Steel 20 ga Plywood ClipPanel Sheathing Clips are used to brace unsupported panel edges when sheathing meets edge to edge without a rafter for support. Select the same size sheathing clip as the panel thickness. Keeps panels even for a level plain on the structure. Quick installation, no nails needed. Provides a 1 8' gap between plywood panels as recommended by the American Plywood Association. 20 gauge galvanized steel.