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Amazon.com: TECHNIKS 1/2" SUPER PRECISION ER20 COLLET .0002 ACCURACY CNC CHUCK MILL : Tools & Home Improvement
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TULX ER11 ER16 ER20 1/4MM 6.35MM 1/8MM 3.175MM 0.008Spring Collet High Precision Collet Set For CNC Engraving Machine Lathe Tool - AliExpress
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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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