Titanium Torx M8 T Nuts

The best hardware you can buy, we have never stripped a titanium torx 40 head.  We have stripped every other kind of bolt and head too many times to remember.  

4x M8 (8mm) titanium bolts 25mm length with Torx 40 head (T40) and T nuts to attach foil mast to board.

This is the best hardware you can find, with much better corrosion resistance than stainless steel and much higher resistance to stripping than Phillips or hex heads.