Dramatically shorten your time spent sanding mill scale off of DOM tubing With this tubing sander from 525 Industries. Your time consuming sanding processes for sanding mill scale off of DOM tubing for roll cages and chassis are over. This hand held die grinder attachment is just as portable as any air tool and can save time by being right at your side when needed. Instead of walking to other areas of the shop for a sander, mount this in a die grinder and sand right where you are working.