![]() For the occasional user, the large, bulky tools are often overkill-a powerful all-purpose drill driver with a hammer-drill setting makes more sense. Among tradesmen working daily, rotary hammers are preferred because of their superior strength and shock-absorbing qualities. In a hammer drill, two ribbed metal discs click in and out against one another, causing impact. In a rotary hammer, a cylinder of air is compressed by a piston, which in turn beats the bit. ![]() Both tools pound the bit while it spins, pulverizing concrete, but the two differ in the mechanisms that do the actual pounding. ![]() Either you use a large rotary hammer or a drill driver with a hammer-drill function. If you need to drive a screw into concrete, you've got two choices.
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