23 PCs ER40 COLLETS SET 1/8" to 1" FOR MILLING LATHE PRIME QUALITY ER 40 COLLET

Suitable for R8, MT, CAT, BT chuck holders. Made from alloy spring steel and hardened to HRC 44-48. Indicated fractional size is true imperial size NOT from metric conversion. DIN6499B standard. Tested T.I.R: 0.0003"