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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