ThunderBay earth augers are built to deliver years of service in even the harshest of conditions. The ThunderBay YZ02 Two Inch earth auger will fit all ThunderBay earth auger powerheads as well as most leading brands in the market. The 7/8" drive shaft opening is the most common size of drive-shaft in the industry. All ThunderBay products are supported by our US based customer service center and all repair parts ship from our US warehouses. You can always get customer service by calling 855-691-5969.