These are for when you need a clean flat bottom with minimal surface damage.
They are woodworking drill bits, NOT construction tools, and should be used in a drill press
We don't have exactly a"set"- more like a collection.
Here's our sizes (in inches):
5/8, 3/4, 3/4, 1-3/8, 1-1/2, 2, 2-1/8"
PNA Tool Lending Library
http://phinneycenter.org/tools/
6615 Dayton Ave Nhttp://phinneycenter.org/tools/
Seattle, WA, 98103
USA