Stanley STMT89439-8B 1/2 Inch Drive Impact Socket 12 mm

Stanley's STMT89439-8B is the 12 mm size in its 1/2-inch drive impact socket range, which covers 23 sizes between 8 mm and 32 mm. Made of chrome-molybdenum steel, it is designed specifically for impact tools, for performance and safety under high torque. Stanley aims it at automotive and industrial users and gives it an optimised socket wall for smooth engagement that resists rounding heavy fasteners. Clear size markings make the right socket quick to find, and Stanley marks the range as exceeding the ANSI standard.