David,I know when I switch to my little edge work tools I'm at the stage I'm not pulling flakes.Hillbilly can back me up on how small the points on my small tools are.When I get to the point of sharpening I'm really breaking a very small edge off,not running a flake.I have tools made of ground to a needle point,steel screw driver and very sharp copper nails.I've not been able to get bone or antler sharpened to as small a point as metal.David, read the thread Billy started about stone points and check out the info on the web sites on obsidian.Basically obsidian can't get any sharper than a fresh flake.