Lapidary Jasper Spanner Bracelet 60mm Deepth Ultra-thin Diamond Hollow Core Drill are made of high quality fine diamond plating, it’s more durable than common diamond bit! The super-thin Electroplated diamond drill bits are one of the finest drill bit manufactured for Hobby, Lapidary, Glass applications. The items are very smooth and thin to meet the most exacting faceting requirements. They can offers a very good cost effective option for those that want very thin kerfs.The front part of the drill bit’s thickness is only 0.6 mm, the material of Processed aren't damaged during drilling process, can reduce material consumption maximize, especially suitable for high value jade, agate, jasper, petrified wood and geodes.