Feature:1. Multiple Usages: This diamond bit can be used for dry drilling and wet drilling, and can be used to drill concrete, red brick, marble and other materials.2. Universal Thread: Featuring 5/811 universal thread, this drill bit can be easily and quickly assembled into a standard fixed coring or handheld drill press.3. Excellent Material: This diamond core drill bit is made of excellent alloy steel with high hardness, and diamond abrasive grains to ensure longer core life.4. Reasonable Design: This diamond hole opener features chip hole, highly regular saw teeth and concentric axes to ensure efficient and fast hole opening.5. Easy Operation: Start drilling from a vertical position and then drill deeper, easy and labor saving, widely used in air conditioning installation, pipe drilling, etc.Specification:Item Type: Diamond Drilling BitMaterial: Alloy Steel, DiamondOpening Diameter: Approx. 102mm / 4inOverall Length: Approx. 240mm / 9.4in.Package List:1 x Diamond Bit1 x Positioning Bit1 x Hex Wrench1 x Saw Blade1 x GasketNote:Manual measurement, the actual size shall prevail.