... advanced equipment,plenty experience timely delivery ISO9001 DIAMOND SEGMENTED HOLE SAW/CORE DRILL BITS FOR DRY CUTTING (FOR DRY CUTTING) ... , long life and high safety.Wide application: boring in reinforced concrete ground and wall, stone, ceramic, airway, bridge road, etc ... .DIAMOND CORE DRILL BIT/HOLE SAW The laser-welded core bit is designed for reliability, efficiency ...