These Dome shaped flywheels make the most decorative bright cuts you’ve ever seen, helping your jewelry stand out from the rest. Contain natural grade-A diamonds for fast, easy bright cutting. When used with a high-speed rotary handpiece (minimum 30,000rpm), these flywheels can make bright cuts in seconds. Mounted on 3mm shanks.  Note: Diamond Flywheels are not covered by warranty. If you are new to bright cutting, we strongly recommend that you purchase a Tungsten Carbide Practice Wheel.  It is the same shape as a 130° diamond flywheel but made of tungsten carbide so you can learn to use a light pressure without risking diamond breakage.