Designed for portable high speed gas or electric saws. Made of double-reinforced resinoid-bonded silicon carbide. Cuts concrete, brick, block, aluminum, PVC pipe, stone, and nonferrous metals. 1/8" thick. No. 9511: 12", 1" arbor, maximum speed 6300 RPM No. 9411: 12", 20mm arbor, maximum speed 6300 RPM No. 9412: 14", 1" arbor, maximum speed 5400 RPM No. 9413: 14", 20mm arbor, maximum speed 5400 RPM