Features Made of high quality spring steel, stable performance. Fine workmanship, good flexibility and high precision. Before inserting the chuck, the chuck must be inserted into the chuck nut. Each chuck is packed in a separate protective container with a label. Used for CNC milling machines and engraving machines to clamp workpieces. Description: These spring collets are made of high quality 65Mn spring steel for CNC milling lathe tool and work-holding engraving machine. There are total 14 collets of various sizes in on set which can basic meet your need. Each collet is well packed in separate protective container with label so you can easily distinguish them. Collet must be placed into collet chuck nut before inserting into collet chuck. Features: Made of high quality spring steel, stable performance. Fine workmanship, good flexibility and high precision. Before inserting the chuck, the chuck must be inserted into the chuck nut. Each chuck is packed in a separate protective container with a label. Used for CNC milling machines and engraving machines to clamp workpieces. Specifications : Material: 65Mn spring steel Model: ER20 Range: 1/16", 3/32", 1/8", 5/32", 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 13/32", 7/16", 1/2" Height: 30mm / 1.18" OD: 21mm / 0.82" Run-Out Tolerance: <0.008mm Weight: 550g(approx.) Package Includes : 1 Set(14pcs) 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