All holders are available in BT MAS 403, DIN 69871 ADB, DIN 2080 & NT 30 seriesCone's tolerance is according to the class AT 3.Collet chucks run out accuracy are according to the norms DIN 6391 which permit a run out error between external cone & internal cone collar seat of 0, 016.Shell end mill adaptors meet the requirements of the norms DIN 6358, which prescribes for O 16, 22, 27, 32 a run out accuracy of 0, 01 for SK 30 40, 0, 015 for SK 50.End mill holders ensure the prescribed holes tolerance & have a run out accuracy which is largely below the requested one (normally 0.005)