Includes: mild steel expander (1 5/8" - 1 7/8" collet, 2" - 2 1/2" chuck), and aluminum alloy expander (2 3/8"- 2 3/4" Collet, 2 3/4" - 3 1/8" collet, 3 1/8" - 3 1/2" collet, 3 1/2" - 3 7/8" collet, 3 7/8" - 4 1/4" collet).
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