The JET Tools R8 series of Impact Wrenches have a twin-hammer impact mechanism that delivers balanced power, and an ergonomically designed grip that absorbs vibration and reduces hand fatigue, according to the company. With a lightweight, aluminum construction, the impact is offers an adjustable, 3-position forward power setting. The wrenches are available in 3/8" (No. JAT-101), 1/2" (No. JAT-104) and 3/4" (No. JAT-105), offering 400 ft/lbs, 900 ft/lbs and 1,500 ft/lbs, respectively.