>>9630393You can scribe a 3mm wide line with a chisel though you will probably use narrower chisels for that most of the time. You can also use these chisels to remove material (like with a woodworking chisels). You can even use them to shave off nubs, especially in hard to reach places.
Hook-like chisels are for scribing lines only and personally I think they tend to dig in deeper than necessary so I use straight regular chisels, like in
>>9630128 more often then hooked ones. HQParts chisels have shallower hooks compared to Creos, so I recommend them.
The "lower two" in
>>9630098 are for scraping off flash (especially from resin) and for controlled demolition, when you need something removed from the model (when customizing etc) or when you need to open up a bubble in resin for proper filling.