CNC Waterjet cutting uses a very high pressure jet of water up to 55,000 psi (3930 bar), usually with an added abrasive medium.
Waterjet cutting provides a high thickness range capable of accommodated from 200mm down to 0.1mm and with accuracy of up to 0.05mm over 1m (positional and repeatability).
The cold process does not heat the parent material, so there is no heat affected zone, burning or surface hardening. Unbeatable detail to material thickness ratio means very small and precise holes can be cut into very thick material.
Surprisingly, Waterjet Cutting competitive pricing beats lasers and milling machines in many circumstances and keeps on going at thicknesses.