... smooth drilling and long life 3, Full range of sizes Diamond core drill bits with brazed segments for concrete wet ... 5mm, 2mm, 2.5mm, 3mm.7, All kinds of thread adaptors or connections in 1-1/4"UNC, 1 ... , M42, CRI28 or PIXIE, etc.8, Full inspection of the adaptor size and concentricity by the most advanced inspection ... Other sizes can be provided upon request. Diamond core drill bits for concrete wet use