14 Piece ER-32 NMTB30 Spring Collet Chuck Set ~ T.I.R. is .0003″. ~ Hardened & ground body for extended tool life. ~ Made of high grade tool steel. High precision collet chuck system. ~ High precision collet chuck system. ~ Complete with fitted case. ~ Includes one each of 1/16, 3/32, 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8 & 13/16″ ER-32 Collets. ~ Spanner wrench is included. ~ Nut diameter is 2.0″. ~ Gage length is 2.36″. ~ Drawbar end thread is 1/2″-13. ~ Overall length is 5.06″.