Loose bolts rattle on your bike frame. No problem, you brought your multi-tool along. Tighten tighten … ack, the damn handle on your tool broke. The lightweight composite handle on Park Tool's Phillips/Flathead Folding Hex Set is 40% stronger than steel handles. This folding multi-tool's 4, 5, and 6mm hex wrenches have high-torque industrial steel tips that add even more durability to the Folding Set. Screwdrivers help you tune your derailleurs on the road.