15pcs ER25 Collet Precision Tool Spring Collet Set From 2mm To 16mm CNC Milling Clamp Chuck Tools For Lathe And Spindle Motors . This is an ER25 precision spring bushing. Widely used in boring, milling, drilling, CNC tapping, carving and other processing operations, also can be operated used with CNC tool holder. Large clamping forces, wide clamping range, high accuracy. Color: Silver Material: 45 Steel Diameter: 25mm Length: 34mm Clamping Size: 2mm 3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mmPackage Included:15*ER25 Precision Spring SleeveOnly the above package content, other products are not included. Note: Shooting light and different displays may cause the color of the thing in the picture a little different from the real thing. The measurement error is +/-1-3 cm.