6 Different Sizes: for drilling holes with a diameter of approximately 22, 2, 8, 35, 44, 68 and 73mm (0.9, 1.1), 1.4, 1.7, 2.7, 2.9 inches. Easy to Use: This is an improved design, simple screw-on design, no old-fashioned assembly. Effective: It uses high-quality alloy coated with metal particles, which is practical and simple. Application: Ideal for opening holes in tiles, ceramics, bricks, drywall, concrete and more. Suitable for hand drills, bench drills, vertical drills, etc. Applicable to: pneumatic drills Item Description: Easy to Use: This is an improved design, simple screw-on design, no old-fashioned assembly. "Note: The data is all manually measured, please allow an error of 1-3cm, due to the difference in light and display, there will be a certain color difference, the actual item received shall prevail.