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. Black UVB clamps offer superior performance indoors and out. 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.