18 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 resistance.SureGrip® 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 Professional Ratchet - 7.5"; 3/8" Drive Extensions 3", 6"; 3/8" Drive 6 Point Sockets - 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"; 3/8" Drive 6 Point Deep Sockets - 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4"; 3/8" Drive Spark Plug Socket - 5/8"