It can easily be said that the most important tools to any bike mechanic are the 4mm and 5mm hex wrenches. With the increasing frequency with which component manufacturers are switching from slotted or Phillips screws to hex for their derailleur limit screws other sizes aren’t far behind. Let’s not forget the ever-increasing prevalence of Torx fasteners on things like stems as well.So, given that hex and Torx drivers are so critical to any bike maintenance task, it makes sense to buy the best tools possible. Unior’s hex and Torx drivers simply fit better than other brands, helping to ensure that you won’t be doing any unnecessary damage to your fasteners.