These 90° 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. Please be aware these have 3mm shanks.  If you are new to bright cutting and have not used a diamond flywheels wee strongly recommend purchasing the 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.  Note: Diamond Flywheels are not covered by warranty.