A Few Precautions To Ensure Safety And Proper Functionality 1?Always wear appropriate safety equipment, including safety glasses, gloves, and protective clothing to prevent injury from flying debris. 2?Before use, ensure that the hole saw is correctly installed and securely attached to the drill. 3?Especially when cutting through hard materials, it's advisable to use a coolant to dissipate heat and prolong the lifespan of your TCT Hole Saw. 4?After each use, clean the hole saw to remove any debris. Specification: Material: Tungsten Carbide Color: Silver Hole Saw Diameter: 2-1/2" / 64mm Shank Diameter: 2/5 Inch(10mm) Total Size: As Shown In The Picture Package Included: 1 x TCT Hole Saw 1 x Titanium Plated Center Drill Bit 1 x Core Drill Bit 1 x Storage Box Practical Recommendations 1.Kindly confirm the necessary product size before proceeding with your order. 2.This Hole Saw cannot be used on concrete, tiles and stone. Please remember to use lubricant when using it to avoid overheating of the drill bit. The lubricant can be water or some kind of oil. 3. As our products are measured manually, please allow for a 1-2 millimeter discrepancy between the actual measurements and the listed dimensions. 4. We strive to ensure that our images closely resemble the actual product; however, slight color differences may exist due to factors such as equipment, lighting, and monitors.