The 14 drills in this picture have very fine tips and

they represent only about 19 examples in the Greg

Perino collection of drills that have very fine tips. 
Many different sizes of holes were drilled in beads

and other ornamental and utilitarian objects. The

drill sizes pictured here represent some of the

smallest holes that could have been made with

micro-drills. The smallest one in this picture measures

3/8 inch (1cm) long.
   Shaping very tiny stone tools (microliths) is difficult

to work in the hand. It's been suggested that the tiniest

examples were probably held in a slotted or grooved

piece of wood or antler so it could be pressure flaked

along one edge.
   Microliths (small stone tools of various function) are

a Later Stone Age phenomenon that were used in countries

around the world from India to the Ukraine and from North

America to Europe.