Started using quite a bit of 3/4" Hardwood Plywood (Birch mostly).  Plan to get in to more cabinet making and needed a box that would last me longer than week :)  Not sure this review will help anyone, since if you are seeking this Kreg screw, you already know what its for!  Plan to get the 5,000+ box next.  Going through 500 quicker than I had anticipated!