The AGKNX Post Hole Auger is for use with tractor mounted post hole diggers and skid steers to make fence installation easier. The heavy-duty auger attaches to most 2 in. hex gearbox output shaft. This auger features thick 6mm double flighting with more extensive welding and a reinforced input shaft collar. for tractors and skid steers with 2 in. hex output shafts. If your gearbox / powerhead uses something other than a 2 in. hex output shaft then an adapter must be used (sold separately).