Take apart furniture usually requires an allen wrench to tighten fasteners. In tight spaces, using a hex wrench can be a frustrating experience. The ball wrench allows the fastener to be rotated even when the tool is not at right angles to the fastener, and this often provides access to hard-to-reach fasteners. The screwdriver handle is particularly useful for this work. This really saves time. A 5/32 ballpoint screwdriver is ideal for most 1/4-20 fasteners. It can also drive a 4mm fastener, but the tool's fit is slightly loose and can result in the hex head shearing off the fastener. Remember that all ball drives have a weak point where the ball attaches to the shaft. . So far I haven't touched the 5/32 driver, but I managed to get the ball off the smaller driver. It's best to use a standard Allen wrench for the last (or first) quarter turn if you need to apply a lot of force to the fastener.