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JT33 to ER-20 collet chuck, milling chuck holder.
This collet chuck is hardened and precision ground and has a T.I.R. is <= 0.0002″ (0.005 mm). The chuck will hold all ER-20 collets.
ER-20 collets have a range of 1/16″ to 1/2″ (1.0 mm to 13.0 mm).
*Collet must be assembled into a collet chuck nut before inserting into the collet chuck.