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Steel Dragon Tools 6in. (152 mm) Wet Diamond Concrete Core Drill Bit Steel Dragon Tools® 6 in. (152 mm) wet diamond laser-welded masonry core drill bit. For use wet drilling asphalt, block, brick, concrete, pavement, and other materials. Wet drilling only. Bit Size: 6 in. (152 mm) Drilling Depth: 14 in. Spindle Thread: 1-1/4 in. – 7 For use on asphalt, block, brick, concrete, pavement, and other materials. Wet drilling only. 10 mm laser-welded split segments for improved operating life. Fits Hilti® and Milwaukee® drill rigs. Overall Height: 16-1/2 in.