Model Number: A-08 Key Specifications/Special Features: Material: Aluminum oxide, silicon carbideBest speed disc, cool cutting, never burned workpiece,can cut everythingeven railway, 40mm steel bar Cutting on gas saw type: 41Wheel size(DxH) RPM Grit Cartonsqty Diameter Thickness(inches) Thickness(mm) Arbor hole 305 1/8 3.5 25.4 6300 30 25 305 5/32 4.0 25.4 6300 30 25 355 1/8 3.5 25.4 5500 30 25 355 5/32 4.0 25.4 5500 30 25 405 1/8 3.5 25.4 3800 30 25 405 5/32 4.0 25.4 3800 30 25