The Klein Tools 4-Inch Precision Adjustable Wrench delivers smooth, accurate adjustments with a precision-machined knurl and parallel jaws that securely grip even oversized fasteners. Crafted from high-strength alloy steel with an electroless nickel zinc finish, it offers exceptional durability and corrosion resistance to withstand the toughest job sites. An ergonomic I-beam handle and laser-etched SAE and metric markings provide maximum control, comfort, and efficiency on every task.