Royal Ultra-Precision ER collets are guaranteed accurate to 0.0002" TIR or better. 16 slot design, providing a larger gripping range. Royal ER Collets are made from high-grade steels imported from Germany and are hardened for long life. This ER11 set includes 7 collets from 1/16" thru 1/4" by 1/32" steps. Using a collet that is perfectly matched to the cutting tool diameter ensures that full surface contact is achieved, resulting in higher gripping force, better accuracy, less vibration, better surface finishes, and longer tool life.
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