General description Built-in self-release design ensures that tools never get stuck in the holder. These spring collets are compatible with any standard ER collet chucks, making them ideal for coolant-thru tool applications. Each collet is individually packed in a protective container with a label for easy identification. Technical specifications Material: 40CR Spring Collet Sizes: 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm Extension Rod Size: C20-ER16A-32L-10MM Measurement allowed error: +/- 1-3cm Usage These collets are widely used in various applications including boring, milling, drilling, silk attack, sculpture, CNC, and other processing tasks. Other information Color: black + silver Performance stability and high accuracy in use.