You can find a HT-204 Hanlong Nibbling Tool in my Amazon Store: amzn.to/2E9Ec1S Or: www.amazon.com/shop/sevenfort... Also, please check out Buzzsah's channel for a Demo of this tool: • Switch Plate nibbler / buzzsah
I've heard about nibbling tools, but never used one. It looks a lot easier than drilling a hole and filing which takes longer. I would use it for cutting square holes for switches, etc. as well. By the way, those Altoid tins make good project cases. :-)