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Josco Bi-Metal Holesaws feature variable pitch cutting edges with special tooth designs for the best cutting results. Manufactured in Germany from strong M42 grade Bi-Metal (9% Molybdenum, 8% Cobalt) with a 38mm cutting depth,Josco Bi-Metal Holesaws have the strength to deliver the best cutting results with the longest life.Diameter: 13/16″ (21mm)Arbors: H1 H3 H3ARecommended Material and Speeds (RPM)Mild Steel: 425 RPMStainless Steel: 210 RPMCast Iron: 280 RPMBrass: 560 RPMAluminium: 630 RPM