Festool sets for spanner work and hand tools
A set takes the choice out of your hands: the sizes that belong together sit complete in one holder, instead of being bought one by one and scattered across the toolbox. That saves searching on site, and it shows at once when something is missing, because an empty slot in the holder is visible.
Festool sets are built around that principle. Tool and holder form one unit, and a ratcheting spanner set in a Systainer goes into the van without repacking and joins the rest of your Festool storage. Look at the size range first. A set that covers the common sizes is more useful in practice than a large set where half the pieces stay unused. Then check how the tools handle in tight spaces, because that is the difference between working on and taking the workpiece apart first.
A complete set is also easier to hand over to a colleague than a pile of loose pieces, since it is clear at a glance what should be there and what is still out on the job. Loose keys and related hand tools are under Festool keys, and hex keys and pin wrenches under Festool hex and pin keys.