The AIRCAT Vibrotherm Drive Impact Wrenches incorporate a patent-pending impact wrench mechanism. This mechanism is designed to reduce vibration levels between 30 and 40 percent, and increase the life of the mechanism by up to 50 percent. The patented muffler system produces low noise levels between 82 dBA to 85dBA. The patented AIRCAT grip and Vibrotherm Drive provides comfort and cosmetic styling. The internal design delivers reduced overall tool length for models 1178-VXL and 1778-VXL.