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This is one tough rotary hammer. With its magnesium gear case housing that provides excellent heat dispersal and its cooling fan that fows air around the gear case, it is capable of drilling up to 9/16 diameter holes in concrete continuously. Also, the large cooling fan provides enough air fow to prevent tool-killing dust buildup, and the two-fnger trigger is sealed to prevent dust entry. Use the Soft hammer selection for holes up to 3/16" diameter and the Hard hammer selection for holes from 3/16" through 3/4" diameter.