A rotary hammer is the tool of choice for most electricians who must make holes in concrete, block and brick. Small rotary hammers are used primarily for drilling holes to install anchors for hanging Unistruts for electrical conduit. Large hammers are used for larger diameter drilling to allow materials to pass through walls. Although hammer drills may be used for making a small number of holes in softer materials, most electricians use a rotary hammer for drilling into concrete, said Mitch Burdick, product manager, concrete products at Bosch Power Tools.
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