Depending on the material and thickness of the material, a low flow, ultra high pressure jet using a very fine media can cut a width of .050 or even less. If the jet "manipulator" has the ability and integrity to move the jet in a precision method and controllable speed, the shape and size of the shape can be whatever is needed, provided the material has the strength to hold together minus the cut width.
I hope this helps!
Jenna Alder
NLB Marketing Asst.
alderjr@nlbusa.com