21 piece set is made in the U.S.A., featuring SK's high polish SuperKrome® finish, which protects the tools from the harsh working environments found in today's workplace. Provides long life and maximum corrosion resistanceSureGrip® Drive Design drives the side of the fastener, not the corner, to provide increased strength and avoid rounding of rusted or damaged fasteners.Made in the USA1/4" Drive Professional Ratchet - 4.5"; Extension Spinner Handle - 6"; 1/4" Drive Extensions - 2", 6"; Universal Joint; 1/2" Drive 6 Point Sockets - 4MM, 5MM, 6MM, 7MM, 8MM, 9MM, 10MM, 11MM, 12MM; 1/2" Drive 6 Point Deep Sockets - 6MM, 7MM, 8MM, 9MM, 10MM, 11MM, 12MM