Extended-Range ER "spring" collets have a gripping range of 1mm, or 0.040", the most of any collet commonly used in tool holding. As an example, a 1/2" collet will compress from 0.500" down to 0.460".
GMT inch sized collets have true nominal inch bores, minimizing compression for maximum concentricity and minimum runout. All collets are precision ground for less than 0.0002" of indicated runout.
| Set |
Sizes Included |
| ER16-Fractional |
1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8 |
| ER25-Fractional |
1/8, 5/32, 3/16, 7/32, 1/4, 9/32,
5/16, 11/32, 3/8, 7/16, 15/32, 1/2, 9/16, 19/32, 5/8 |
| ER32-Fractional |
1/8, 5/32, 3/16, 7/32, 1/4, 5/16, 11/32, 3/8, 7/16, 15/32, 1/2, 17/32, 9/16, 5/8, 21/32, 11/16, 3/4, 25/32 |
| ER40-Fractional |
1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 1 |
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