Features and Benefits: High strength, heat-treated alloy steel bits are securely broached into chrome plated sockets; No set screws to tighten!; Bit sets store in a convenient vinyl storage holder; Skin-packed. Shipping wt. 10 oz.; Includes: 3, 4, 5, 6, 7, 8, 10mm; This is a Lisle 7-Piece Socket Set 3/8 in. Square Drive. High strength, heat-treated alloy steel bits are securely broached into chrome plated sockets. No set screws to tighten! Bit sets store in a convenient vinyl storage holder.