Product Description:- -Made of high-quality materials, -The glass drill bit is made of high-strength carbon steel with a smooth nickel-plated surface that minimizes low resistance and easily drills precise holes in seconds.-The diamond drill bit starts drilling diagonally, braids them into a circular braid, and then keeps the drill straight. Water lubrication is required when drilling.-Suitable for drilling glass, ceramic tile, block jars, fiberglass ceramic tile, slate marble, granite pumice stone (especially glass and ceramic tile). Diamond coated core drill bits can remove the full circle from these materials.-Each diamond hole saw has been treated smoothly and precisely with surface treatment, which reduces the cutting resistance and drilling pressure, increases sharpness, and uses water lubrication.-Please start drilling at an angle of 45 degrees to the surface and align with 90 degrees when the hole is formed-Simple operation and convenient use.-Better effect with electric drill. (Not Included)-Size: (Outer Diameter) 3/4/5/6/8/10/12/14/16/18/20/22/25/26/42mm Packing List:1*15pcs Diamond CutterNotes:1. Due to various factors such as display brightness and light brightness, the actual color of the product may be slightly different from the picture on website.2. Please allow slight deviation between the data and manual measurement.