CompatibilityThis collet has a wide range of applications and meets or exceeds the original factory specifications, can be directly replaced to meet your various needs.Suitable for CNC milling tools, high-speed engraving machines and other processing. Universal specificationModel: ER11; Range: 4mm, 1/8", 6mm; Height: 18mm; OD: 11.5mm; End-of-stroke tolerance: <0.008mm. High-quality materials This collet is made of high-quality spring steel, rust-free, anti-corrosion and high strength for maximum durability. Professional tools This collet has high precision and sensitivity. Designed to have the same form, fit and function as the original part, can directly replace the broken or shabby part. Fine workmanship, good flexibility, high precision. Note The chuck must be placed in the chuck nut before inserting it into the chuck (each clip is clearly marked so you can easily distinguish them)