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3" Core Drill Bit. Wet Use. 1 1/4" x 7 arbor thread. Used for reinforced concrete and heavy masonary drilling. 14" x 3" x 3". Weight 6 lbs. Great core drill bit for general purpose core drilling. Laser welded Teeth. Best used on a core drill machine of 900 RPM or better. Cuts concrete, reinforced concrete, block and brick really fast. Strong bit. We usually get 100+ holes with this very same 3" core drill bit on the project we do here in North Carolina.