Amazon.com: Techniks 1/4" Super Precision ER20 Collet .0002 Accuracy Chuck Mill : Tools & Home Improvement
Parlec ER20-0281 | 0.83" Diameter x 9/32" Shank x 1.24" OAL ER Collet - All Industrial Tool Supply
Amazon.com: TECHNIKS 1/2" SUPER PRECISION ER20 COLLET .0002 ACCURACY CNC CHUCK MILL : Tools & Home Improvement
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
CO-ER20 4-Pc High Precision CNC 1/8, 1/4, 3/8 & 1/2 Inch Dia x 32mm Long Spring Collet Collection for ER20 Nut