The ATD-551 features torsion design which allows the bit to flex to protect and extend the life of both bit and fastener, an Impact rated to withstand a higher torque load without stripping or breaking, a CNC precision machined to maximize fit into fasteners for extended bit life, heat treated for durability and toughness, manganese phosphate coating for corrosion resistance. The Set contains: (6) Phillips: (2) PH2 x 2", (2) PH2 x 5", (2) PH3 x 2", (2) Square Drive: S2 x 2". S3 x 2", (5) 2" Metric Hex: 4mm, 5mm, 5.5mm, 6mm, 8mm, (5) 2" SAE Hex: 5/32", 3/16", 7/32". 1/4", 5/16", (7) 2" Star: T10, T15, T20, T25, T27, T30, T40 , (4) 5" Star: T25, T27, T30, T40, (5) 5" Metric Hex with Ball Tip: 4mm, 5mm, 5.5mm, 6mm, 8mm, (5) 5" SAE Hex with Ball Tip: 5/32", 3/16", 7/32", 1/4", 5/16", (1) Slotted: 6-8 x 2", (2) 2-1/2" Adapters: 1/4" x 4", 1/4" x 3/8", (1) 2-3/4" Adapters: 1/4" x 1/2", (2) 6" Adapters: 1/4" x 1/4", 1/4" x 3/8", (2) Chucks: 1/4" x 1/2", 1/4" x 6" and (3) 2-1/2" Socket Drivers: 1/4", 3/8", 5/16".