5pcs/set SHDIATOOL Diamond Drill Core Bits Kit for Tile Porcelain Granite Marble

Golden Dry Diamond Drill Bits with box  Specificiation: Diamond Height: 15mm; Total Length: 75mm; M14 Thread Diameter 20+35+40+50+68mm Drill Bit Application:  Dry/wet drilling for porcelain tile, granite, marble, ceramic Feature:  1.Less Chipping, Minimizing breakage, less heat generation, Better finish quality2.Vacuum Brazed technology provides longer working life, Fast and smooth drilling3.High diamond exposure rate provides a faster and more aggressive drilling4. Vacuum Brazed technology provide much longer working life than electroplated ones (Generally 3-5times),Save your money and time....5.Having less loss of material