12-Piece Metric and SAE Hex Tamperproof Set includes sizes 1/8 in., 9/64 in., 5/32 in., 3/16 in., 7/32 in., 1/4 in., 5/16 in., 3 mm, 4 mm, 5 mm, 6 mm and 8 mm. Socket bits can be used with the appropriate rachet, T-handle or socket spinner handle. Bits made from S2 tool steel with proprietary heat treat for superior strength and durability. Precision tip profile manufactured for positive and precise fastener engagement. Sockets made from alloy steel with proprietary heat treat for long life and lasting performance. Fully polished, chrome plated sockets for superior corrosion resistance. Design of socket and bit assembly allows for easy replacement of broket or worn bit. Tip sized appropriately to 1/4 in., 3/8 in. and 1/2 in. square drives for maximum torque and minimum damage to tips or fasteners. Bits and sockets made to exacting specifications. Comes with color coded storage rail.