[2-in-1 Multi-Functional Design] This diamond drill bit set combines precision drilling and smooth milling functions. Whether you are installing bathroom fixtures, creating customized glass artwork, or working with tiles, glass bottles, marble, ceramics, or granite, it effortlessly handles (1/4inch , 5/16inch , 3/8inch , 1/2inch holes) and edge trimming. [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 Granite and Porcelain Tiles, [Cooling Wax Lubrication for Smoother, Safer Operation] Included heat-resistant cooling wax reduces friction by 60%, preventing cracks in delicate glass/ceramics and minimizing dust. [ndustrial-Grade Durability with Vacuum Brazed Technology] These vacuum-brazed diamond drill bits feature a thickened diamond coating that ensures zero grit loss, eliminates wobbling, and delivers ultra-stable performance during heavy-duty tasks. [Portable Storage Case] The beautiful and practical transparent storage case allows each diamond drill bits to be neatly stored in the tool room and at your fingertips. Color: As Shown Material: Steel Package Contents: 5pcs x Tile Drill Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.