Features The spring chuck is made of high quality spring steel, with exquisite workmanship, smooth and delicate appearance, durable and long lasting. The engraving lining has good workmanship, good elasticity, high precision, 100% new, high quality, reliable and safe quality. Before inserting the collet, the collet must be inserted into the collet nut, which has stable performance and strong practicality. Each chuck is nicely packaged in an individual protective container with a label that is sure to make your life more enjoyable. The collet set is used for CNC milling machines and workpiece clamping engraving machines with a variety of functions and obvious effects. Feature The spring chuck is made of high quality spring steel, with exquisite workmanship, smooth and delicate appearance, durable and long lasting. The engraving lining has good workmanship, good elasticity, high precision, 100% new, high quality, reliable and safe quality. Before inserting the collet, the collet must be inserted into the collet nut, which has stable performance and strong practicality. Each chuck is nicely packaged in an individual protective container with a tag that is sure to make your life more convenient. The collet set is used for CNC milling machines and workpiece clamping engraving machines, with a variety of functions and obvious effects. Specifications: Material: 65Mn Spring Steel Model: ER11 Range: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 1/8", 1/4" Height: 18mm/0.7" Outer Diameter:10mm/0.39\" Runout Tolerance: Package List