Features With A Protective Storage Box: There are a total of 9 sizes of the ER32 spring collet set, which can basically meet your needs. Each clip is installed in a separate protective container with labels, so you can easily distinguish them. Professional design: The tube clip adopts professional design, has a compact appearance, is easy to carry and use, and can quickly complete and uninstall quickly. Selected 65mn Spring Steel: These spring clips are made of the selected 65MN spring steel and used for CNC milling machine tools and working carving machines. You Need to Insert: Before inserting collet chuck, you must put the collet in the chip jam nut. Used for CNC milling tool tools and work carving machines. Good Elasticity: Workholding engraving collet have fine workmanship, good elasticity and high accuracy , have a lightweight and delicate shape, which can satisfy our use well. Features: 1.Made of spring steel, they are stable in performance. 2.Fine workmanship, good elasticity, high precision. 3.Collet must be placed into collet chuck nut before inserting into collet chuck. 4.Each collet is well packed in separate protective container with label. 5.For CNC milling lathe tool and work-holding engraving machine. Specifications: Material: 65Mn spring steel Model: ER32 Range: 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 16mm, 18mm, 20mm Height: 40mm / 1.57" OD: 31mm / 1.22" Run-Out Tolerance: <0.008mm Weight: 1.23kg(approx.) Package Includes: 1 Set(9pcs) x Collets Note: 1. Please allow 1-2mm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Package List