[Cooling Wax Lubrication for Smoother, Operation] Included heat- cooling wax reduces friction by 60%, preventing cracks in delicate glass/ceramics and minimizing dust. [2-in-1 Multi-Functional Design] This drill bit set combines drilling and smooth milling functions. Whether you are installing bathroom fixtures, creating customized glass artwork, or working with tiles, glass bottles, marble, ceramics, or , it effortlessly handles (1/4inch , 5/16inch , 3/8inch , 1/2inch holes) and edge trimming. [ndustrial-Grade Durability with Vacuum Brazed Technology] These vacuum-brazed drill bits feature a thickened coating that ensures zero grit loss, eliminates wobbling, and delivers ultra-stable performance during heavy-duty tasks. [Pro Performance on Tough Materials, DIY-Simplicity] Engineered for tile drill bits challenges,It breezes through ceramic Tile Plant Pots Glass Mosaics Glass Bottle Marble and Porcelain Tiles, [Portable Storage Case] The beautiful and practical transparent storage case allows each drill bits to be neatly stored in the tool room and at your fingertips., Manufacturer: PokFhgur