The Crank Brothers Y-Tool 16 is practically a portable workshop, with almost every tool you might need on the trail. Tucked away inside the compact stainless steel package is a variety of hex wrenches, Torx bits, and screwdrivers, along with an 8-, 9-, and 10-speed chain tool, CO2 inflator, and two spoke wrenches. If you can think of anything else you'll need, you're far more prepared than the rest of us.
chain tool: 8/9/10 speed compatible
spoke wrenches: #0, 1
hex wrenches: #2, 2.5, 3, 4, 5, 6, 8
screwdrivers: phillips #2, flat #2
torx: t-25, t-10