ER20 Metric End Mill Extension Holder, 4mm Hole Diameter, 9.5mm Extension Diameter, 16mm Extension Length
ER-Style mill extensions enable micro tools to clear fixturing, maintain exceptional TIR at extended lengths, and solve deflection and chatter issues. They twist and snap into MOST standard ER clamping nuts, and limit TIR to <0.0002" at extension. Set screws hold small shank tooling securely in a triangular arrangement for excellent accuracy. An internal stop can be adjusted from both ends of the holder using a standard hex key to fine-tune stick out.
