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Specifications: Material: high quality steel, diamond dust coating Color: Silver Quantity: 16 pcs How to Use Correctly: Step1: Use pen to mark start of hole, and keep wet with WATER or COOLANT. Step2: Angle drill 45 degrees to start hole, and being drilling at low speeds. Angle drill to vertical position once the hole has started. Step3: Minimum pressure. Slow speed down for exit hole or drill from the other side to prevent breakthrough. Dimension: 6mm(1/4"), 8mm(5/16"), 10mm(3/8"), 12mm(1/2"), 14mm(9/16"), 16mm(5/8"), 18mm(11/16"), 20mm(3/4"), 22mm(7/8"), 22mm(7/8"), 25mm(1"), 26mm(1-1/32"), 28mm(1-3/32"), 30mm(1-1/8"), 40mm(1-1/2"), 50mm(2") Packing List: 16 x Drill Bits