Shuts off flow through many different hoses including vacuum, fuel, and coolant lines. The ratcheting mechanism on the pliers locks the jaws when squeezed together. Heavy-duty swivel jaws pivot to ensure parallel pinching with no damage. Made of high-quality steel, for dependability and long life. 10 in. (24.5cm) long tool with opening width 0.8 in. (2.03cm).