These convenient line clamps are essential for mechanics and car specialists to pinch off fuel, vacuum, transmission, brake line, heater lines and other fluid lines safely and easily. Each line clamp is specially designed to stop flow without damaging or compromising the hose, making them a great set of clamps for any professional or home garage! Specially designed to stop flow without damaging the hose Sizes: 3/8 in., 1/2 in., 1 in., 1-3/4 in.