This is the best in the wheels. It will grind aggressively while leaving a minimum of swirl marks. The turbo arrangement of the segments creates a cyclonic action that works excellently with the side pickup of the dust muzzle. Features: 1) Diameter: 4", 5" 2) Thread: 5/8" - 11, M14, M16 3) Thickness: 0.2" (5mm) 4) Width: 0.8" (20mm) 5) Mesh sizes: coarse 30 / 40, medium 60 / 80 6) Customized specifications are available 7) High efficiency grinding and long life