The 22 PC. Ball End Hex Key Set features a variety of key sizes each with a ball end design that allows for easier fastening at an angle. The entire set has a black oxide coating that increases rust resistance. The included accessory handle provides 9X more torque by turning each key into a t-handle driver. Sizes include: (13) SAE : .05-inch 1/16-inch 5/64-inch 3/32-inch 7/64-inch 1/8-inch 9/64-inch 5/32-inch 3/16-inch 7/32-inch ¼-inch 5/16-inch & 3/8-inch; (9) MM : 1.5mm 2mm 2.5mm 3mm 4mm 5mm 6mm 8mm& 10mm.