- Denver, Colorado, United States
- Nov 21st
A chipless round hole cutter including a screw shear and die body which cooperate to provide a round hole in a sheet of metal, electrical box, oil pan, or boiler where internal access for a multi-piece knockout tool is limited or undesirable. More info can be found at patents/US3761192 Cutting bore diameter of .860 and leaving no chips inside the work piece. Appears to have never been used.