These are salmon head recovery boxes 304 2g stainless steel for fisheries and ocean Canada , What they do is clip the adipose fin on a hatchery salmon also tag the jaw.They release the salmon in streams and rivers. When you catch a salmon you determined if it is wild or hatched (wild will have the adipose fin). If it is a hatchery salmon cut head off place it in recovery box. These heads will be scrutinized by a scientist to determined where it was relesed how old, what heath,where it was caught based on location of box ,usually a wharf close to a good fishing hole here in B.C. This is one of a bunch of projects I have tig welded with my 210ext and I'm happy with the refinement of the arc on this machine. Rare earth tungsten are my new favourite.