The IREGA 4 in. Ergonomic Adjustable Wrench is made of Chrome Vanadium steel and has no wobble or play on the lower jaw which helps ensure the perfect grip on a nut or bolt. Non-protruding jaw shank and slim profile allows access to tight spots. The wrench has a triple chrome (nickel/chrome/nickel) finish for maximum corrosion resistance. The SAE and metric measuring scales directly on the vise for the best fit.