Tank Wrench10 openings. Includes a boxed opening for B and MC Acetylene valves and a socket for Commercial Acetylene cylinders. Made to fit your valve stems and gas fittings. Holes are smooth and accurately sized. Handles are larger for better leverage. Finish: Black Oxide; Opening Size: 7/16 in [Min], 1 1/8 in [Max]; Opening Type: Open; Overall Length: 9 in; Weight: 0.90 lb.