Before drilling any holes on any materials you need to use this auto punch tool. It makes a mark on metal, wood, plastic, copper, brass etc. then you can drill thourgh like a pro.
So far happy with the tools the tri-fold case is nice and the tools do not fall out if you happen to try and open it upside down. I dont like the plastic latches they seem to put on most tool cases these days. The latches invariably wear out or break off and then your tool case opens up every time you go to pick it up.
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