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 total 15 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. _x000D_ _x000D_ _x000D_ Features: _x000D_ Made of high quality spring steel, they are stable in performance. _x000D_ Fine workmanship, good elasticity, high precision._x000D_ _x000D_ Collet must be placed into collet chuck nut before inserting into collet chuck. _x000D_ Each collet is well packed in separate protective container with label. _x000D_ For CNC milling lathe tool and work-holding engraving machine._x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: 65Mn spring steel _x000D_ Model: ER20_x000D_ _x000D_ Range: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm_x000D_ Height: 30mm / 1.18"_x000D_ OD: 20mm / 0.78" _x000D_ Run-Out Tolerance: