The Mayhew Tools 7-Piece Metric Ball Hex Socket Set includes sizes 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, and 10mm. Socket bits can be used with the appropriate ratchet, T-handle, or socket spinner handle. 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 broken or worn bit. Tip sized appropriately to 1/4-Inch, 3/8-Inch, and 1/2-Inch square drives for maximum torque and minimum damage to tips or fasteners. Bits and sockets made to exacting specifications. Includes color coded storage rail.