Patented WrightGrip 2.0 technology provides unparalled tool-to-fastener contact resulting in a superior anti-slip combination wrench. Precision Heat-Treated and tempered for optimal hardness, ductility and durability Easy to read stamp pattern in order to quickly determine opening size Made in the USA, Designed, Engineered and Manufactured in Barberton, OH Meets and exceeds ASME B107 hand tool standards