This 4-piece fluid line clamp set is designed for quickly and easily clamping off fuel, vacuum, brake, and heater pipes. Unlike spring-type clamps, these feature a U-bolt design operated by a thumb screw, ensuring they won't spring open and fall off. The set includes four clamps with varying sizes: Clamp 1 up to 3/8" (10 mm), Clamp 2 up to 1/2" (15 mm), Clamp 3 up to 1" (25 mm), and Clamp 4 up to 1-3/4" (45 mm). Caution should be exercised with larger pipes, particularly with Clamp 4, to prevent damage. Suitable for fuel lines, vacuum lines, transmission lines, brake lines, and heater lines.