Check the listing for details. 16-50 mm Sintered Diamond Hole Saw Cutter Core Drill Bit Masonry Drilling Bits. Condition: New. Listed at 12.60 USD. New Professional diamond Marble hole saw core drill, Made of high quality diamond with precision drilling speed and long life use Description: Product Name: Diamond Drill Bit Material: Metal, diamond Hole Diameter: 16-50mm (You can choose Hole Diameter from the variety of Hole Diameter) Hole Diameter External Diameter Internal Diameter Shank Diameter Rim Length Drilling Depth Total Length 16mm(5/8") 16mm 11mm 10mm 7mm 50mm 80mm 18mm(23/32") 18mm 13mm 10mm 8mm 50mm 83mm 20mm(close to 3/4") 20mm 15mm 10mm 8mm 50mm 83mm 25mm(close to 1") 25mm 20mm 10mm 9mm 53mm 83mm 30mm(1-3/16") 30mm 25mm 10mm 9mm 53mm 83mm 35mm(1-3/8") 35mm 30mm 10mm 9mm 53mm 83mm 40mm(1-9/16") 40mm 35mm 10mm 9mm 53mm 83mm 45mm(1-3/4") 45mm 40mm 10mm 9mm 53mm 83mm 50mm(close to 2") 50mm 44mm 10mm 9mm 53mm 83mm Quantity: Only 1 Piece Color: Gold, Silver Tone Application: Mainly used for drilling Porcelain Tile, Ceramic Tile, Marble, Granite ,Rebar Concrete and other hard material. Ideal for drilling the faucet mounting holes in stone countertops, plumbing lines in showers, and vanities Method of Use: Use Wet or Dry To prolong its using life, must use with water for cooling and lubrication. Gold paints on the body of this bit to avoid getting rusty. Feature drilling stably, fast speed, not breaking the border. The hole saw can be used with Bench drill, hand electric drill. When you using hand electric drill, start slowly, 45 degree angle, go vertical after you make an initial mark. We Can List Any Size & Amount Of This Product: Hole Cutter Diameter from 6mm – 50mm Regular Air postage from China to Worldwide is takes 15-25 days delivery to your home We will send out your order within 1-2 days after payment has been received and cleared. Please let us know if you are looking for other accessories or hardware. Should you have any queries, please contact me directly.