Model Number: A-19 Key Specifications/Special Features: Materials: aluminum oxide and silicone carbideTypes: T41 and T42Aluminum oxide: normal steel, low hardness cast iron, sharpening steel, saws steels rough work, steel finishingSilicon carbide: marble and natural stones, low hardness cast iron, soft building materials, soft refractory materialsBest speed disc, cool cutting, never burned work piece,can cut everythingeven railway, 40mm steel bar Wheel size(DxH)rpm Grit Cartonsquantity Diameter Thickness(inches) Thickness(mm) Arbor hole 100 1/8 3 16 15200 30 400 115 1/8 3 22 13200 30 200 125 1/8 3 22 12300 30 200 150 1/8 3 22 10300 30 100 180 1/8 3 22/16 8600 30 100 230 1/8 3 22 6600 30 100