The torque suppression arm has been engineered to absorb all torque reaction of the tool through the solid steel structure. The high quality of the construction, which includes bearings in all joints, ensures freedom of movement and helps reduce operator fatigue. The models (4601, 4603, 4605, 4606, 4609 and 4610) are designed to work with any pneumatic tool which weighs five lbs or less. Models 4602, 4604, 4607, 4608, 4611 and 4612 are designed to work with push-to-start electric screwdrivers which weigh five lbs or less. The electric version can also be used by push-to-start pneumatic screwdrivers in case your application changes. All optional heads can be replaced with a few tools in a matter of minutes, making our torque suppression arm very versatile. The standard 4601 or 4602 torque arm comes with a home position assembly, 18" support column and a bench mount. Other options available are the wall mount and filter, lubricator, and regulator with bracket and hoses and fittings. This mechanically designed torque suppression arm has no pneumatic, hydraulic or electric parts. This means you will receive exceptionally long life with this product. Our torque arm was designed, developed, and manufactured in our U.S. plant.