Features and Benefits: Set includes: 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm and 19 mm; Forged from the finest chrome-molybdenum alloy steel, the best choice for strength; Radius corner design extends the life of fasteners; design drives the side of the fastener instead of the corner; Black oxide finish and has etchings for identification; This is an impact socket set with 7-piece. Sockets are 1/2 in. drive, universal and metric. Includes a heavy molded storage tray.