Bosch 21618 - 18V Impactor 1/2 inch High-Torque Impact Wrench. With this 18V Impactor™ 1/2" High-Torque Impact Wrench (21618) from Bosch, youll be able to complete any heavy-duty project. With a hammer and anvil system delivering 350 ft-lbs of torque this tool is perfect for those touch applications. And the ergonomic soft grip handle gives you the added comfort and a more controlling grip.