Gardner Bender Plastic Clamps are tough, durable, yet extremely lightweight and feature clean, smooth edges to minimize damage to cables. the contractor-friendly design facilitates quick installations saving time and money. Clamps securely hold harnesses, cables and tubing up to 1/2 inch (13 mm) diameter. Designed for use in construction, maintenance and assembly-line applications, control cabinets, panels and general applications. Choose these clamps for superior performance indoors. Working temperature range -54 Celsius (-66 Fahrenheit) to 170 Celsius (340 Fahrenheit) Instructions Position clamp at desired location, insert cable(s) or tube(s), fasten with screw or nail.