Feature●Set Contents: Hex shank (diameter: 0.25 inch (6.35 mm)); 7 different sizes: 0.12 inch (3 mm), 0.12 inch (4 mm), 0.24 inch (5 mm), 0.23 inch (6 mm), 0.3●High Quality Material: Surface Treatment: Titanium coating. Made of hard and durable carbide, hardness is higher than normal drill bits. Strong strength and abrasion resistance, long service life●4-blade tip design: The drill bit is made of carbide alloy with 4-blade drill speed and can easily penetrate a variety of materials (tile, concrete, brick walls, glass, mirrors, plastic braid, wood). The four-blade design makes the machine more stable and efficient in the process. Warm tips: When digging hard materials (glass, porcelain floor tile, marble or granite) please use water or oil to lubricate it●Compatible models: Hex shank (diameter: 0.25 inches (6.35 mm)); This drill bit is compatible with most charging drills and charging impact drivers. Compatible devices: Hand drills, lithium drills, tabletop drills, and hard materials, please use lubricating water for drilling 1,000 rpm. Ideal for drilling bathroom tiles or wall holes●Applications: Can be used in a wide range of situations. Ideal for tile, concrete, plastic steel, aluminum alloy, gypsum board, brick walls, glass, mirrors, plastic, wood, ceramic tiles and marbleDescription