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https://www.boltontool.com/er-collet-chuck-tool-holder-cat40-er25-g2-5-2-3-4-20000rpm-0-0001 from www.boltontool.com
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T.I.R. ≤ 0.0001" at collet face 2. Rear thread for pull stud is 5/8" - 11 3. Balanced to G2.5 at 10000 rpm 4. Works on all CAT40 machines.
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