Omega Products BT40 ER Collet Chuck - ER20 - 20,000RPM - G2.5 - 150mm Gauge Length - Form ADThe BT40 ER Collet Chuck is a precision tool holder designed for BT40 spindles, delivering secure tool clamping and dependable performance in CNC milling and precision machining. This model features an ER20 interface, 150 mm gauge length, and Form AD for stable, repeatable tool retention. Compatibility: Designed for BT40 spindle systems to ensure reliable integration with standard BT40 machines. Collet interface: ER20 ER collet design for secure,