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Tool Test:Combination Rotary Hammers Rotary Hammers The best 1 9/16-inch models are fast and compact, and sport sturdy side handles Victor Rasilla Hammer drills and small rotary hammers are fine for light work, but for tough jobs there is no substitute for a large combination hammer. The company I work for does additions and whole-house remodeling in the San Francisco Bay area. In this seismically active region, the engineers are always specifying added hold-downs to transfer shear loads to foundations. As a result, we frequently find ourselves drilling multiple holes in existing stem walls and grade beams. This spring, my