After several problems with the centering the vise on my drill press, I decided to go with the Nova Chuck Pen Drill Jaws and couldn't be happier!!! I've never had a problem with them and they ALWAYS allow me to drill a properly centered hole no matter what the size of pen blank! My only problem is that I spent $50+ on the drill press vise when I should have gone for the $45 pen drill jaws. My advice...don't waste your time, money or wood on the pen vise, to with the Nova jaws everytime!