Review on Century Drill Tool 5320 CoPilot by Ron Patel

Works well but too expensive for this length of metal rod thread On one End. The problem with this design is that the threaded section will only work with a 1/2"-20 hole saw mount and therefore will only work for 1-1/4" hole saws and smaller. For $22, you get very limited utility, so not a very good price. Better to buy a Bosch device.