Gardner Bender Plastic Clamps are tough, durable, yet extremely lightweight and feature clean, smooth edges to minimize damage to cables. Our contractor-friendly design facilitates quick installations saving time and money. Clamps securely hold harnesses, cables and tubing up to 3/8" (10 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 C (-66 F) to 170 C (340 F). Instructions: position clamp at desired location, insert cable(s) or tube(s), fasten with screw or nail.