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Product Name: Vacuum Brazed Diamond Dry Drilling Core Bits Quantity: 1 Piece 102mm (4 Inch) Specification: Diameter: 102mm, Max working depth: 50mm, Diamond height: 15mm, Total Length: 75mm **The Thread of bit is 5/8-Inch-11, Recommended Machine: angle grinder** If you fit them on drill or other machine, you need an adapter, such as SDS, hex, Round plus shank... Application : Dry/wet drilling for porcelain tile, granite, marble, stone, Masonry, brick... Feature: 1. Minimizing any breakage and safe for operator 2. High quality Diamond Grain provide fast and smooth drilling 3. Vacuum Brazed technology provide much longer working life than electroplated technology =========THE END========== Available Diameter: 6mm-152mm(1/6 Inch to 6 Inch). ABOUT SHDIATOOL: We are a professional Manufacturer & Supplier of diamond tools in China, If you have any needs or questions about our products,please contact us firstly, thanks, we have good After-sales service, better quality and professional suggestions.