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ETM 23/64", 3/8", 25/64" Individual ER20 Collet, .394" - .354" Range - 4500116 - 67-813-048 - Penn Tool Co., Inc
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ER20 Spring Collet Set for CNC Engraving Machine and Precision Milling Lathe Tool Range 1/16", 3/32",1/8", 5/32",3/16", 7/32"1/4", 9/32",5/16",11/32", 3/8",13/32", 7/16", 1/2" - - Amazon.com
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