Size: 3/8-inch SAE open end and box end. Design Type: 12-point extra-long pattern, providing greater reach and leverage compared to standard-length wrenches. Finish: Fully polished chrome for high corrosion resistance and easy cleanup. Country of Origin: Made in the USA. Anti-Rounding Technology: The box end incorporates a radius corner design that engages the flats of a fastener rather than its corners. This configuration increases torque transmission by up to 20% and prevents fastener rounding.