Features BETTER CUTTING This hole drill bit ensures low cutting resistance and allows for a clean cutting edge and high efficiency. Total 12 pieces: there are 12 pieces hole openers, and the different specifications will certainly meet your work requirements and greatly simplify your operation. Flexible use: allows wide application on granite, marble, artificial stone, glass, quartz stone, stoneware, etc., very practical. Good materials: by combining an emery coating with a carbon steel material, the hole saw provides high accuracy and excellent durability for longer use. EASY INSTALLATION The soldered hole drill bit is lightweight and compact, very convenient to install within minutes. Specification: Item Type:Brazed Hole Drill Material: Emery, Carbon Steel Usage Widely used for various types of stone tile, such as ceramic tile, marble tile, granite tile, etc. Product specification: approx. 6 mm/0.24 inches, 8 mm/0.31 inches, 10 mm/0.39 inches, 12 mm/0.47 inches, 14 mm/0.55 inches, 16 mm/0.63 inches, 18 mm/0.71 inches, 20 mm/0.79 inches, 22 mm/0.87 inches, 25 mm/0.71 inches. 998 inch, 390 mm / 1.18 inches, 35 mm / 1.38 inches. Package list: 12 x soldered hole drills. 1 x plastic box. Package List 12 x Brazed Hole Drill Bit 1 x Plastic Box