Diamond core drill bit is sintering with diamond grain, which has the characteristic of high hardness and wear-resistant, can drill smoothly with no broken edges for a long time. Diamond drill bits are well packed in a metal box with a handle for easy storage and convenient to carry out. Diamond hole drill bit can be used as wet drilling or dry drilling according to your work requirements. Great to drill on a variety of materials, including porcelain tile, ceramic tile, stone, ceramics, masonry brick, quartz, glass, marble, and so on. Diamond hole saw set can be installed on hand drills, electric drills and bench drills. Note: This porcelain drill bit is not suitable for drilling on wood or metal. Adding water or lubrication when drilling can prolong working life.