Seven piece set, 3/8" square drive. High strength, heat-treated alloy steel bits with black oxide finish are securely broached into plated sockets. No set screws to tighten! Bit sets store in a convenient vinyl storage holder. Sizes: 1/8", 5/32", 3/16", 7/32", 1/4", 5/16" and 3/8". Made in Clarinda, IA, U.S.A.