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 3/4 inch (19 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).