Adjustable spanner is Comes with a laser mark scale and black phosphate finish. Precision marked scale indicate correct jaw opening. Heat treated spanner wrench for home or commercial use. High quality tool for all relevant purposes. Long term Rust free. Easy to grip. The item Has got a “jaw” of adjustable width, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener, as with a conventional fixed spanner. “We are offering a wide range of Pipe Wrench-Stilsons to our clients. Offered with adjustable jaws these wrenches are offered with teeth angles that grips the round corners of soft pipes and fittings. Designed to offer a rigid structure these wrenches are meant for heavy work. These are obtainable in red handle and are hardened and tempered in nature. Our products are used in gas, oil and civil engineering industries. Made from high grade carbon steel, with high grade malleable cast iron housing, suitably knurled nuts and specially designed compression springs 2.Hardened on Jaws 50 to 60 HRC 3.On jaw shank: 35 to 45 HRC”