Premium Stainless Steel Drill Powered Mash Stirrer & Mixer - 1/4 Inch Hex DriveThese stainless mixers attach to an electric drill for easy and thorough mixing of your mash. To get the best mash efficiency it is important during mashing in to ensure that there are no dough balls (clumps of grain) and that the grain bed is not compacted. Allowing maximum recirculation through your grain bed will always yield higher extraction efficiency rates of your brew. Simply attach to your portable electric drill and attach the 1 4" end