6 different sizes: for drilling holes of approximately 22, 2 8, 35, 44, 68 and 73 mm (0.9, 1.1), 1.4, 1.7, 2.7, 2.9 in.) diameters.< /p> Easy to Use: This is an improved design, a simple bolt-on design, not an old-fashioned assembly. Effective: High quality alloy is used, coated with metal particles, which is convenient and easy. Application: Ideal for opening holes in tile, ceramic, brick, drywall, concrete and more. Suitable for hand drills, bench drills, vertical drills, etc. Applicable to: pneumatic drill Item description: Easy to Use: This is an improved design, a simple bolt-on design, not an old-fashioned assembly. "Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, l 'actual object received shall prevail.Note: The data is all measured manually, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.