Check the listing for details. 6-25mm M14 Thread Granite Vacuum Brazed Core Bits Stone Diamond Core Drill Bits. Condition: New. Listed at 18.98 USD. 16mm -25mm Diamond Drills Bit Hole Cutter M14 Thread for Granite Ceramic Marble Tile Glass Specifications: Product Name: Diamond tip masonry bit, Dry core drill bits, Dry core drill bits concrete Please choose from the drop down menu which Size best qualifies your need. Available Hole Diameter as below： Hole Diameter Head Diameter Shank Diameter Total Length Drilling Depth Quantity External Diameter Internal Diameter External Diameter Internal Diameter 6mm (close to 1/4") 6mm 2mm 21.5mm M14 Thread 60mm 34mm 1 Piece 8mm (close to 5/16") 8mm 3.2mm 21.5mm M14 Thread 60mm 34mm 1 Piece 10mm (close to 3/8") 10mm 6mm 21.5mm M14 Thread 60mm 34mm 1 Piece 12mm 12mm 7.8mm 21.5mm M14 Thread 60mm 34mm 1 Piece 14mm (close to 9/16") 14mm 9mm 21.5mm M14 Thread 60mm 34mm 1 Piece 16mm (close to 5/8") 16mm 11.5mm 21.5mm M14 Thread 60mm 34mm 1 Piece 20mm (close to 3/4") 20mm 14mm 27mm M14 Thread 60mm 39mm 1 Piece 25mm (close to 1") 25mm 19mm 27mm M14 Thread 60mm 39mm 1 Piece Quantity:Only 1 Piece Features: Brand New & High Quality, Easy to use,Good Performance and Long life Coarse grit diamond, best on marble, granite and tile Excellent for making clean and accurate hole on granite, marble, rock, gemstone, shells, tile and glass etc. Drilling speed: Drill a Holes In Seconds Use wet or dry Water or other cooling agent is recommended for longer life of the bit. Works better with a electric drill (Excluding in this item) A new generation of tools, innovative Diamond BRAZED Hole Cutter Lasts up to double life longer than conventional diamond coated hole cutter , saving time and money Quick Tips 1. Start drill at 45 Degree to surface and align to 90 Degree as hole forms 2. Never use drills while machine is in hammer action. 3. Holes Require No Further Work As Cutting Is Clean Regular Air postage from China to United States is FREE and takes 10-25 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.