This Milwaukee Impact Socket Adaptor features a 3/8" to 1/2" drive size, making it suitable for various impact applications. It is constructed from SHOCKWAVE IMPACT DUTY steel (Chrome-Molybdenum) for exceptional strength and durability. The adaptor includes a dual hole design and groove for security accessories and a ball detent design for superior impact socket retention. Markings for diameter are stamped and ink filled, while the part number is laser etched for wear resistance. Milwaukee Tool has been a leader in providing innovative solutions for professional construction users since 1924.