Bosch is appealing to users in need of a lightweight tool for drilling in tight spaces with the introduction of the RHS181 compact rotary hammer. Ergonomically designed to reduce user fatigue, the tool measures 10.9 inches long and weighs 4.6 pounds. Its high-performance motor makes it the most powerful spring-loaded chuck, 18V Li-ion rotary hammer on the market, the company claims. The drilling tool has a variable speed trigger, a two-mode drive that allows the user to switch between drilling with and without hammer action, and an LED work light.