Seals flexible brake lines, fuel and vacuum lines, heater and radiator hoses. Smooth rounded edges to insure no damage to the internal hose reinforcement. Locking feature allows hands free use. Bright high-visibility color. Fiber reinforced industrial polymer construction Master set contains one each small, medium and large line clamps. Size ranges: small line clamp: 1/8" (3mm) - 5/16" (8mm); medium line clamp: 1/2" (13mm) - 3/4" (19mm) and large line clamp: 3/4" (19mm) - 2-1/4" (57mm).