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Steel Dragon Tools 5" (127 mm) x 6" Dry Diamond Masonry Core Drill BitSteel Dragon Tools 5 in. (127 mm) x 6 in. Dry Diamond Laser Welded Masonry Core Drill Bit. For use on block, brick, concrete, and other materials.5 in. x 6 in. dry core drill bit13/16-inch female threads.10 mm laser-welded split segments for improved operating life.Drilling Depth: 6 in.Barrel Height: 6-1/4 in.Steel Dragon Tools diamond core drill bits have a one (1) year warranty against manufacturer defect. Factory conforms to ISO-9001-2000 Quality Control Systems and ISO-14001-2004 Environmental Systems.