HIGH QUALITY: The diamond hole saw cutting blades are made of high quality carbon steel and diamond coating with fine workmanship to provide more efficient performance.
HIGH EFFICIENCY & DURABILITY: Our diamond drill bits are glass thickened diamond design with uniform nickel plating. The surface of the drill set is smooth, cutting resistance is greatly reduced, and the large cutting edge is smoother for durability and longer service life.
HIGH ADAPTABILITY & APPLICATIONS: This glass drill bits has an overall length of 2-2.2" (50-55mm), with a universal round drill shank that can accommodate hand drills, cordless drills, bench drills and more.
WHAT WILL COME: A nice plastic box and 12 hole saws of different sizes: 1/4 in (6mm), 5/16 in (8mm), 3/8 in (10mm), 1/2 in (12mm), 7/8 in(22mm), 1 in (25mm), 1-1/2 in (40mm), 2 in (50mm).
WARM TIPS: Before use, please position it at 45 degrees and then work vertically. And please keep adding water when the diamond hole saw bit is working on glass or ceramics. We give you a lifetime warranty, if you have any questions, please contact us through Amazon.