"K" Series "D" Series Compare the weight of this 4 bolt to the competition! This rugged tool features the best power to weight in its class for increased job site productivity. In addition, this unit features a convenient "D" shaped handle and outside trigger, along with a strong four bolt backhead for easy serviceability. "A" Series Renowned for its valve life and handle durability, this classic tool is widely used throughout industry and construction. It is ideal for light demolition work, bridge decking, concrete surface preparation, metal removal, form stripping, and many other applications. "W" Series Same tough specifications as the "A" series units, but with a heavy duty front end featuring a threaded barrel and rubber buffered retainer for increased steel and retainer life. Uses round collared accessories.