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Steel Dragon Tools 4" (102 mm) Dry Diamond Concrete Core Drill Bit Steel Dragon Tools® 4 in. (102 mm) dry diamond laser-welded masonry core drill bit. For use dry drilling asphalt, block, brick, concrete, pavement, and other materials. Dry drilling only. Bit Size: 4 in. (102 mm) Drilling Depth: 16 in. Spindle Thread: 1-1/4 in. – 7 For use on asphalt, block, brick, concrete, pavement, and other materials. Dry drilling only. 10 mm laser-welded split segments for improved operating life. Fits Hilti® and Milwaukee® drill rigs. Overall Height: 16-1/4 in.