Sockets feature Torque Dispersing System (TDS) design which spreads stress evenly and reduces fastener rounding. Black oxide finish ensures long-lasting durability and resists corrosion. High-quality alloy steel construction. Includes: 2", 4" and 6" extensions, 1/4" Drive Universal Joint, 1/4"-3/8" Drive Adapter, Standard, Mid-Length and Deep sockets 5mm to15mm and Fine Tooth Ratchet