The Vacuum-Brazed Diamond Drill Bit Set from Beijing DEYI Diamond Products CO. LTD, has advanced every other diamond tools ever made. Long-standing dedication throughout our companies to R&D makes it possible for our products to incorporate all advancements in respecting materials and engineering – allowing the user to carry out their tasks in the construction & renovation industry without fear of their tools breaking. It is well known, the vacuum brazing process is used to enhance bond strength, but it also assists with an improved distribution of diamonds within the matrix for better overall cutting. Thus whether you are a contractor, stone fabricator, or just do it yourself, we have the right drill bits for you so that you get exactly what you want.