The Park Tool THH is a really nice hex key with bits that can slide back and forth, which gives the key a multitude of possible uses. For example, it can be used both as an ordinary hex key and a T-key. The tool is made of Chrome Vanadium and S-2 steel. All the keys have a Speedspinner that makes it fast to screw in even long bolts. The silver-coloured end is designed like an ordinary hex key, while the black end is called a Strip-Gripper and is particularly suitable for bolts where the head has become larger than usual.