Dry Drill Core Bits for Brick, Concrete Block, Masonry – 2-1/2inch Diameter 5/8inch -11 Threaded #30/40 Diamond Grit

The open air slots have been removed to ensure proper vacuum suction, and the vacuum swivel setup is designed for dust extraction and fits standard vacuum hoses. – Pilot bit will not be compatible, and our regular dry core bit will also not be compatible to the vacuum swivel due to arbor differences. – For reinforced concrete and granite, please use wet core bits. – Segment Height:10 mm