This holder accepts all .500 shank tooling All critical surfaces precision ground Made from alloy steel hardened to 54 - 56rc Balanced to G2.5 at 20,000 rpms Gage length is 1.2 inches Concentricity is less than .0001 Rear thread for pull stud is M12 X 1.75 MariTool Part# is BT30-EM.5-1.2
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