8 Pc ER16 Spring Collets with R8 Chuck. You are purchasing a 8 Pc ER16 Spring Collets with R8 shank ChuckPart Number: 230-1818. Collet and Chuck. 8 pcs spring collets. 3/32", 1/8", 3/16", 7/32", 1/4", 5/16", 11/32", 3/8" collet size.
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