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