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High Precision CAT 40 END MILL Holder, Taper to Bore Runout <0.0002" Balanced G2.5 x 30,000 RPM, Made out of High Quality Chromium Steel, H5 Bore Tolerance, DIN AD+B Coolant Capabilities, Taper Shank Ground to AT3 Accuracy ( Or Better), CAT40 DRAW BAR THREADS 5/8"-11, 100% inspection quality control in the USA. Mirror Bright Finish Machinist Choice..... VETERAN OWNED........