Attributes:*Diamond Hole Saw: 7mm / 0.28"*Shank: 1/4";Package Contents:*10 pieces Diamond Drill BitsFeatures:---These drill bits are easy to use and deliver smooth and efficient drilling. They are engineered to provide high precision, allowing you to create clean and smooth holes without chipping or damaging the material.---Designed for professionals and DIY enthusiasts, this set offers exceptional cutting power and durability for a wide range of materials.Useful Tips:---Apply Lubrication (water): Depending on the material you are drilling, you may need to apply lubrication to reduce friction and prevent overheating. This is particularly important for metal or hard materials.---Place the tip of the coated brazed diamond hole saw on the desired drilling spot, ensuring that it is perpendicular to the workpiece surface.