GripStrips provide safer footing and may help prevent slips and falls. They are tough, long-lasting, re-usable, and GripStrips are resistant to weather, pressure washing, shoveling, and even salting, no peeling or ripping! <br>Each GripStrip is pre-punched and slotted, there is no drilling required. Wood naturally swells with moisture and contracts as it dries, the slots are designed to accommodate this expansion.