Every application has its tool, and very tool has its application. This statement is particularly true in the world of power tools, especially with respect to hammer drills and rotary hammers. These two tools are often mistaken for one another, and it's not hard to see why — they look so much alike. What immediately sets them apart is price. At first glance, a $150 hammer drill (with 3/4-inch-diameter hole capacity) seems preferable to a $225 rotary hammer with a 7/8-inch hole capacity. The hammer drill has more amps, and the rpm on each tool's two-speed motor are nearly the same. So why would you ever buy the more expensive rotary hammer?
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