4932480303 Milwaukee Impact Socket 9mm x 1/2 Drive, best fit thanks to 6 gripping points plus non-slip hex geometry prevents socket and fastener rounding. Other features of the 9mm Milwaukee Impact Socket include a dual hole design and groove for security accessories with easy read stamped and ink filled diameter markings and laser etched part number for wear resistance. Manufactured from SHOCKWAVE IMPACT DUTY steel (Chrome-Molybdenum), high quality Milwaukee Alloy Steel providing ultimate strength and durability