Contains: 8", 10" and 12" Hose Pinch Off Pliers; Shuts-off flow through vacuum lines, fuel lines, coolant lines, etc.; Ratchet mechanism holds pivoting jaws tightly in place; Heavy-duty swivel jaws pivot to assure parallel pinching; Max Openings: 8" - 1" Max Opening; 10" - 1" Max Opening; 12" - 1-3/8" Max Opening