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SHDIATOOL Diamond Core Drill Bit,Hole Saw Diameter 28mm 1-1/8" M14 Thread Vacuum Brazed for Concrete Granite Marble Porcelain Tile Masonry Brick,3PCS Quantity: 3 piece; Diameter: 28mm; Diamond Height: 10mm; Total length: 60mm; Connection: M14 thread Vacuum dry/wet brazed diamond drilling bits Core bits with M14 thread A diamond grains of the tops offers superior cutting strength for creating a... SHDIATOOL Diamond Core Drill Bit,Hole Saw Diameter 28mm 1-1/8" M14 Thread Vacuum Brazed for Concrete Granite Marble Porcelain Tile Masonry Brick,3PCS