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Sthor 57091 Information The Sthor 57091 is an electric impact wrench that is designed for heavy-duty applications. It has a power rating of 800 watts and a maximum torque of 325 Nm, making it suitable for loosening and tightening nuts and bolts in a variety of materials, including steel, iron, and concrete. The wrench features a two-speed transmission with a maximum speed of 2,500 rpm and a blow rate of 4,000 blows per minute. It also has a variable speed trigger for precise control over the amount of torque applied. The wrench is equipped with a 1/2" square drive socket and comes with four impact sockets in sizes 17mm, 19mm, 21mm, and 22mm. The Sthor 57091 is a well-made and powerful impact wrench that is ideal for professional and DIY users alike. It is easy to use and maintain, and it comes with a generous warranty.