WarmWire Cable Strap is used to hold WarmWire Cables in place on the sub floor surface at the spacing you choose. All 3 spacing options 2, 2.5 and 3 inch can be maintained using this thin metal strapping. Cut the strap to length using ordinary snips. You can anchor the strap with Screws on plywood or backer board and with spray glue, hot glue or 2-sided tape on concrete. Order 1 roll of strap (25 ft in length) for each 40 to 50 Square Feet of Cable to be installed (not linear feet)