Forged tank wrenches fit most valve stems and gas connections Socket-holes are deep, smooth, and precisely sized for solid connections Larger handles for firm grip and better leverage. Specifications Hazmat NO Length [Nom] 8-1/2 in Material Steel Opening Size [Nom] 7/8 in; 1 1/8 in Prop 65 NO Stock Status In Stock Type Tank wrench Used With Regulators; Torches; Commercial Acetylene Cylinder