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Comparison : Item # EM1634MK, 19.5 Millimeter (mm) Dimension L1 for Backworking Collet Holder
Item # EM1634MM, 44 Millimeter (mm) Dimension L1 for Backworking Collet Holder
Item # EM2034MK, 25 Millimeter (mm) Dimension L2 for Backworking Collet Holder
Item # EM2034MK-AK1, 34 Millimeter (mm) Dimension L2 for Backworking Collet Holder
Item # EM2034MM, 28 Millimeter (mm) Dimension L3 for Backworking Collet Holder