Here's a summary of the ASW Power screwdriver insert extension 550 square drive 1 ″: This heavy-duty screwdriver insert is designed for the toughest jobs, perfect for electric and pneumatic impact wrenches. With its 25.4 mm square drive and special steel material, it can handle the most demanding tasks. The oiled surface provides extra grip and protection, making it a reliable tool for commercial use. By attaching this insert to your impact wrench, you'll be able to tackle even the toughest screws with ease, saving you time and effort.