These 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. Have 3mm shanks. If you are new to bright-cutting we strongly recommend purchasing a practice flywheel. Note: Diamond Flywheels are not covered by warranty.