The Mayhew Tools 16012 8-Piece Philips socket bit set includes P1 (2x), P2 (3x), P3 (2x) and P4 (1x). Socket bits can be used with the appropriate ratchet, T-handle, or socket spinner handle. Bits made from S2 tool steel with proprietary heat treatment 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.