8Pcs M14 M10 5/8"-11 Thread Vacuum Brazed Diamond Core Drill Bits

for Tile Marble Granite Dry Drilling

1. Vacuum brazed diamond core bits are very aggressive,ideal for drilling ceramic,porcelain and tile as well as granite, marble with super high precision while leaving smooth edges with minimal chipping.
2. Vacuum brazed technology is superior to electroplating,thus the bits last much longer than

electroplated diamond bits.
3. They can typically drill more than 30 holes although life is dependent on type of material. 
4. You can expect each bit to last dozens of holes drilling marble and similar stones.