ETM - Collet Set: 12 Pc, Series ER20, 1/16 to 1/2" Capacity - 03765138 - MSC Industrial Supply
ER20 Collet | Avid CNC
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