22 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 USA3/8" Drive 6 Point Sockets - 10MM, 11MM, 12MM, 13MM, 14MM, 15MM, 16MM, 17MM, 18MM, 19MM; 3/8" Drive 6 Point Deep Sockets - 10MM, 11MM, 12MM, 13MM, 14MM, 15MM, 17MM, 19MM; 3/8" Drive Pro Ratchet - 7.5"; 3/8" Drive Extensions - 3", 6"; 3/8" Drive Spark Plug Socket 5/8".