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High speed steel blade & mandrel set. Screw mandrel. For use with rotary tools. 20,000 RPM maximum speed. Suitable for hand and power drills. Includes: 1-3/4" 72 tooth blade. 1-3/8" 36 tooth blade. 1-1/4" 36 tooth blade. 1" 36 tooth blade. 7/8" 36 tooth blade.