Precision-Ground jaw slides make for the smoothest action. Manufactured from high alloy steel using the most up-to-date manufacturing process and heat treated for greater strength and durability. Meets or exceeds ASME b107.8m-1996 And us federal spec. Ggg-W-631B. REED has been producing fine tools for worldwide professional trades since its founding, in 1896, by carl REED. REED celebrates its 118th year of business in 2014. From the company's beginning, REED associates have invented tools that continually become industry standards, including the quick release tubing cutter, various tools for plastic pipe, vises, plus hinged cutters and rotary cutters for large diameter pipe.2Large serrated knurl for smooth easy jaw adjustment | Handle is up to 70% wider for more comfort, less hand fatigue | Hex jaw design allows for a more secure fit to the fastener reducing the chance of slipping | Wide capacity jaw opens up to 25% wider than standard adjustable wrenches | Made in the USA