Part of my tool kit is a muti compartment box, which has the assorted Red, Blue and yellow crimps, mainly ring crimps and the through crimps
The other section carries uninsulated 10mm, 16mm, and 25mm cable lugs, with the through crimps aswell
Then in my tool box i have the regular ratchet tool for the insulated ones, and a larger one that does up to 25mm, its around 18 inches long
i find that carrying these do most of the " just turn up and do it " jobs, nothing like putting a machine in, then not having the correct size crimps to fit the main switch / breaker etc
I work with machines and supplies up to 25mm day in - day out, and anything that requires a larger cable would have generally required a site visit first, therefore i would know to get the correct lugs and take my big crimp tool to the job ( up to 400mm )
But for everyday stuff i would be lost without the smaller setup
Hope this helps