ToolPro 4 in x 4 in Wall Repair Patches are constructed of selfadhesive fiberglass mesh over a square of very thin perforated galvanized steel Just press the wall patch over the hole, finish with drywall mud and paint as you desire The repair is quick, economical, and simple to perform The galvanized steel will not rust or discolor while providing the lightest, strongest patch availableTen 4 in x 4 in patches in sturdy boxPatch can be easily trimmed to any shape or size for use around door frames and outlet boxesEasy to use patches produce professional looking results, providing permanent, rustproof repair on walls or ceilingsSelfadhesive fiberglass mesh holds patch firmly into place while surface is being preparedProtective film on each patch keeps mesh clean until removed for useWill not sag or shrink