• ER Spring Collets are the only Clamping Collet System for combined milling, drill, reaming, tapping and boring • ER Collets concentricity guaranteed to .0004″ • Wide holding range of each collet requies fewer collets and changes-guarantees that undersize cutting tools can be held without sacrificing accuracy or gripping power • Unique self-releasing sytsem eliminates sticking • Flute holding capabilities for highest concentricity and clamping power • ER Mini-Collet Chucks allow for machining in tight locations with reduced outside nose diameter • Clamping range is .039″