Made of resinoid-bonded aluminum oxide. Cuts all types of metal, including steel, bronze, brass, copper, aluminum, and iron. 5/8'' round arbor and 13/16'' diamond knockout. 10'' blade does not have diamond knockout. No. 28026: 6-1/2'' No. 28027: 7'' to 7-1/4'' No. 28077: 7'' to 7-1/4'' No. 28028: 8'' No. 28030: 10''
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