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Operation 1) Hammer drilling operation When drilling in concrete, granite, tile, etc., press the button on the c mark side fully. Be sure to use a tungsten-carbide tipped bit. Do not apply more pressure when the hole becomes clogged with chips or particles. Instead, run the tool at an idle, then remove the bit partially from the hole. By repeating this several times, the hole will be cleaned out. 2) Drilling operation When drilling in wood, metal or plastic materials, press the button on the mar