Made of premium CR-V steel, heat treated to achieve both strength and ductility. Enough strength to withstand pressure without deformation for long-lasting service Serrated jaws are designed to have multiple points of contact on the fastener, and the precision serrations provide a strong bite and grip to easily grab flat, hex, round and square fasteners Up to 2.1 " jaw capacity fits objects of various sizes and shapes. 7 positions offer variable gripping widths to provide greater flexibility Ergonomic, Anti-slip grips are designed to fit the curve of the palm to reduce hand fatigue and provide secure grip when working SK manufactures a wide range of hand tools, including socket sets, wrenches, screwdrivers, pliers, and more, continuing its dedication to provide high-quality products for professionals SK 12-Inch Groove Joint Pliers, Water Pump Pliers, Premium CR-V Steel Construction, Serrated Jaw with Comfortable Grips