33 piece set is made in the U.S.A. and is our most versatile bit socket set. Bit sockets feature SK's high polish SuperKrome® finish, which provides for long life and maximum corrosion resistance.Through-hole design makes it easier to replace worn or broken bits: simply pop the old bit out and insert a new replacement bit.Made in the USA3/8" Drive Fractional Hex Bit Sockets - 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16", 3/8" ; 3/8" Drive Metric Hex Bit Sockets - 2MM, 2.5MM, 3MM, 4MM, 5MM, 6MM, 7MM, 8MM, 9MM, 10MM; 1/4" Drive TORX® Bit Sockets - T10, T15, T20, T25, T27, T30; 3/8" Drive TORX® Bit Sockets - T40, T45, T50, T55; 1/4" Drive Screwdriver Bit Sockets - 1/4" Slotted, 9/32" Slotted, 5/16" Slotted, Phillips #1, Phillips #2; 3/8" Drive Screwdriver Bit Sockets - Phillips #3, POZIDRIV® #2