CROSSTECH RA Shank(Right-Angle Latch) Diamond burs are highest rated multi-use diamond burs by independent non-profit dental education and product testing foundation. One Low Price for all shapes and grits. Five burs per package, manufactured with natural diamonds which produce more cutting surfaces than synthetic diamonds; also Swiss multi-coating technique is used to offer the highest level of cutting efficiency with less clogging and durability. One-piece stainless steel shanks with special heat treatment ensure rigidity, strength and precision.