Product Overview ER20 MT3 COLLET CHUCK ER20 MT3 MK3 Collet Chuck With M12 Drawbar Thread Item(s) 1 Pc. ER20 MT3 Collet Chuck With M12 Drawbar Thread Specification DIN6499B 0.015MM (0.0006") Run-Out Tolerance High Grade 1065 Carbon Steel Hardened & Precision Ground Product Photos Additional Technical Information