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Wrightus Diamond Drill Bits,Tile Hole Saw Remover Tools Specifications: Material: Steel,Diamond Tile Application:Drilling of brittle materials such as glass, ceramics, and marble Dimension:30mm, 40mm, 50mm, 60mm, 70mm, 80mm M30: Outside Diameter 30mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs M40: Outside Diameter 40mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs M50: Outside Diameter 50mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs M60: Outside Diameter 60mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs M70: Outside Diameter 70mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs M80: Outside Diameter 80mm, Shank Diameter 9.0mm, Drill Hole Depth 30mm. 1 Pcs Use of The Diamond Drill Bits Step 1: Use markers to mark the start of hole.Angle drill 45°to start hole at low speeds and get a arescent mark. Step2 : Angle drill to vertical position before the hole has started. Step3 : Reduce pressure and slow speed down for exit hole and drill from the other side to prevent break. Caution:Keep wet with WATER or COOLANT at work. Package : 6 Pcs * Diamond Drill Bit