Description: _x000D_ These spring collets are made of high quality 65Mn spring steel for CNC milling lathe tool and work-holding engraving machine. There are 3 collets of various sizes in 4mm, 1/8" and 6mm. Collet must be placed into collet chuck nut before inserting into collet chuck. _x000D_ _x000D_ _x000D_ Features: _x000D_ Made from high quality 65Mn spring steel, they are stable in performance. _x000D_ Fine workmanship, good elasticity, high precision and run-out tolerance is less than 0.008mm._x000D_ _x000D_ Collet must be placed into collet chuck nut before inserting into collet chuck. _x000D_ Each collet is marked clearly so you can easily distinguish them. _x000D_ Great collet for CNC milling lathe tool and work-holding engraving machine._x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: 65Mn spring steel _x000D_ Model: ER11_x000D_ _x000D_ Range: 4mm, 1/8", 6mm_x000D_ Height: 17mm_x000D_ OD: 8mm _x000D_ Run-Out Tolerance: