General description 9Pcs ER25 Spring Collets and 1Pcs MT3 M12 Collet Chuck Morse Taper Holder are designed for CNC milling lathe tools. This set includes precision spring collets that are widely used in various machining operations such as boring, milling, drilling, tapping, and sculpture. The ER25 collet provides a big clamping force, a wide clamping range, and high accuracy, making it a reliable choice for professionals. Technical specifications Model Number: ER25 Clamping sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm Material: Metal Color: Silver and Black Measurement allowed error: +/- 1-3cm Compatibility and accessories Compatible with MT3 cutter bar Package includes: 9 ER25 collets, 1 MT3-M12 extension rod, and 1 wrench