I am beginning to make rock walls from sandstone. I occasionally need to split rocks or trim goonies off the stones I pick up (Pocono sandstone formation, fyi). Using a carbide drill bit and this hammer drill, I can very quickly drill holes for my feathers/wedges to split the stones. Using the chisel function, I can chisel off layers or even do cuts across the grain. Using a point and the chisel function, I can knock off high points, though I usually use my hammer and a carbide chisel from Trow and Holden for that, since it's simpler and I have more control that way.
SergioB 
