Features Easily Use: 14mm glass pores need to be installed in professional drills or electric drills. You can easily use our tools to explore thick materials. Diamond Coatings: These diamond openers are made of selected materials. The thick diamond coatings on the top provide excellent cutting strength to maximize drilling. Wide Application: Openings are a necessary tool accessories that can be opened on tiles, glass, fish tanks, marble, granite countertops, ceramics, porcelain, etc. Open Holes: These glass hole saw set along the drill bit facilitate the entrance of cooling water and escape of chips and other particles from drilling, thus making the drilling process easier. Professional: Diamond hole saws are designed and constructed by unrivalled knowledge and expertise of brazing and coating edges and surfaces with the very hardest of materials. Features: 1.Easy to use, Good Performance and long life 2.Excellent for making clean and accurate hole on glass, tile, granite and marble 3.Works better with a electric drill ( Excluding in this item ) Specification: Material: Diamond Color: Silver Size: 14mm Package included: 1 x Glass Hole Saw Notice: 1.Please allow 1-3mm error due to manual measurement pls make sure you do not mind before you bid 2.The colors may have different as the difference display,pls understand Package List