Forget about OnStar, this is all you need! Our best selling get-you-out-of-roadside-trouble tool by a country mile. With the Multi-17 you'll be ready for basic mechanical problems, or real technical puzzlers. Comes with 2, 2.5, 3, 4, 5, 6, 8mm hex wrenches, 4 spoke wrenches, chain tool, Torx T-25, 2 screw drivers, 8/10 open wrench. The Torx wrench is cool for disc brake rotors. Like the Multi-5, it's lightweight and unobtrusively sits in a jersey pocket.