Metal fabrication is the building of metal structures by cutting, bending, and assembling processes:Cutting is done by sawing, shearing, or chiseling (all with manual and powered variants); torching with hand-held torches (such as oxy-fuel torches or plasma torches); and via numerical control (CNC) cutters (using a laser, mill bits, torch, or water jet). Bending is done by hammering (manual or powered) or via press brakes and similar tools.