... , Fast, smooth drilling and long life 3, Full range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use 1 ... , For drilling concrete, reinforced concrete , concrete products ,masonry walls3, Fast drilling ,smoothly and long life;4, Available diameters from 10mm to 800mm ... , Other sizes can be provided upon request. Diamond core drill bits for concrete,wall,floor,masonry, dry use