This is single brush of the new twisted steel, it will fit any QuickWood product with the Hex shaft. If you want to put in on a hand held tool for your drill please be warned that this is heavy stuff and you might not want to fill out the whole spindle. I weight the 4" hub for a drill pin and its about 5.5 lbs all together. This is a very nice tool that diggs deep into the hard wood. Its heavy but it works fast.