This Centaur Precision Tools ER40/R8 Collet Chuck is designed to hold ER32 Collets and has an R8 Shank. Allows the user to change tools without removing the chuck from the spindle.
Straight-Shank ER20 Collet Chuck (Extension) (Hex) | 1 in.
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ER8 Straight-Shank Collet Chuck (Extension)