8 piece deep well impact socket set with 3/8 inch drive. Features 6 point deep wells with recessed corners to drive torque across the flats for a more secure fit and longer socket life. Made of heavy duty chrome molybdenum steel for maximum durability. Thin wall construction helps to access tight spaces. Black oxide finish resists corrosion. Permanent large laser etched size markings for easier socket identification. Comes with a magnetic non-marring storage rail with a ball lock retention design for easy on / off socket storage. Set contains 8 sockets in 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, and 3/4 inch sizes.