Hollow Base points have deeper concave bases than any other projectile point in the world. One or more of their fragile "ears" are usually found broken off. Complete examples are rare. They may have been designed to break on impact. If that isn't the explanation they might be considered to be a poor design, which is hard to believe since they were made for approximately 2,000 years!

   Hollow Base points were hafted onto the ends of spear shafts by sliding the point into grooves cut on either side of the shaft. Hafted examples still exist in the museum at Cairo, Egypt.
   The Hollow Base point in this picture is made of a very dark opaque chert of good quality and measures 1 13/16 inches long. The depth of the base is slightly over 1 inch.

Hollow Base spear point from Egypt.