Description: 【Premium Material】Brazed Diamond Hole Opener with Center Drill Bit is made of metal and diamond materials, which is strong, high hardness, does not shed sand, and can be used for a long time. 【Use】Diamond Hole Opener is suitable for drilling holes in ceramics, granite, marble, ceramic tiles, ordinary glass and other materials. 【Features】Glass hole drill bit is suitable for lithium electric drills, cordless drills, and bench drills. Handle type: triangular handle. 【Note】When using the Brazed Diamond Hole Opener, water needs to be added for cooling throughout the process, and drilling of tempered glass is prohibited. 【Package List】1x Brazed Diamond Hole Opener with Center Drill Bit, 1 Allen wrench Specification: Material: metal diamond Size Chart: total length 7cm/2.76inch Working depth 4cm/1.57inch Handle diameter 1cm/0.39inch Package Includes: 1 Brazed Diamond Hole Opener with Center Drill Bit 1 Allen wrench Note: Please allow slightly errors 1-2cm differences due to manual measurement.