Makita 4-Inch Carbide Tipped Splined Shank Concrete Core Drill Bit. Complete with special carbide tipped centering pin. For use in non-reinforced concrete, block and brick. For use in rotary hammers that accept spline shank bits. The item “Makita 4-Inch Carbide Tipped Splined Shank Concrete Core Drill Bit” is in sale since Sunday, October 13, 2019. This item is in the category “Business & Industrial\Light Equipment & Tools\Drills & Hammers\Core Drills & Rigs”. The seller is “four-o-one” and is located in East Greenwich, Rhode Island. This item can be shipped worldwide.