Park Tool P-Handle Torx PH-T1.2

This Torx kit makes tinkering much easier. The high-quality torx-keys are made of steel. The advantage of this is you'll be less likely to flatten the screw thread and damage screws. In addition to two ends, the keys have a nifty plastic handle. This enables you to easily screw and unscrew bolts without hurting your hands.

Torx is getting increasingly common on bicycles. The advantages of Torx compared to a traditional Allen key is that Torx has more leverage points. As a result, you'll have more grip and you'll be less likely to flatten screw threads.