Unior Y-Hex Wrench The Best Tool To Have One of the best tools to have as a home mechanic is the Y-hex tool. With the ability to switch quickly between different hex sizes paired with an ergonomic handle, you'll be able to keep all your bolts tight with ease. The Unior Y-Hex Wrench is offered in several different configurations for every purpose you can imagine. You can either get a 4, 5, and 6mm option or a 2, 2. 5, and 3mm option. Features Quickly change between different hex sizes Ergonomic handle makes it easy to get the leverage you need Available in multiple options including a ball-end hex option | Unior | Y-Hex Wrench 4Mm, 5Mm, 6Mm