Great invention, Poorly made!!!1st, If you buy this take it to a welder and have them finish welding the spinner tip to the nut, or do this yourself if you have a welder. The manufacturer put two small spot welds which do not hold! This comes with two spinner tips that screw onto the long drill shaft. I broke off both tips within 30 minutes, fortunately I have a welder and put a good bead all around the nut. After that it works like a champ!!!!AGAIN, Great invention, however get it welded proper...