... ,ceramics,refractory materials and reinforced concrete and so on Diamond Core Bits for marble and granite are used for drilling all ... ,glass,ceramics,refractory materials and reinforced concrete and so on ,with high efficiency,long life and standard drill hole. stone drills1 ... as granite ,marble ,glass,etc .2,Size: 8mm--200mm.M14,5/8"-11 Connection3,Feture:fast cutting and long life4,MOQ:50pcs5 ...