What kind of screw head

After Sue T's comment, to google for 8 point screw heads, and finding out here on the forum, what bit fit the heads, a #2 square Roberson, l found a source to buy the screws. This company, Hickory Trailer Parts, calls them "exterior trailer Tek" screws. Still don't believe I will buy any, as it seems to me, they would strip out much easier than a standard 4 point square, that I am more familiar with.

http://hickorytrailerparts.com/catalog/index.php?cPath=39&osCsid=adffq9k385ga0u6gecmidbqtg6

Also good info on the bing search page listed by mobe, just above, where it shows the actual tool referred to as a metric W1395 and where you can buy them, www.toolking.com