... and long life 3, Full range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use ... diameters from 10mm to 800mm.5, Available effective working length 380mm, 400mm, 450mm, 500mm, extra long up to ... 1500mm.6, Available wall thickness: 1.5mm, 2mm, 2.5mm, 3mm.7, ... M16, M42, CRI28 or PIXIE, etc.8, Full inspection of the adaptor size and concentricity by the ...