Features Stable Performance -- Made from high quality 65Mn spring steel, these collets ensure stable performance during CNC milling and engraving, providing reliable results. Precise and Elastic -- With fine workmanship and good elasticity, these collets offer high precision and run-out tolerance of less than 0.008mm, ensuring accurate and consistent machining. Easy to Use -- Collet must be placed into the collet chuck nut before inserting into the collet chuck, making it simple and convenient to secure your workpiece. Clear Identification -- Each collet is marked clearly for easy identification, saving you time and effort in finding the right size for your CNC milling lathe tool or work-holding engraving machine. Versatile Tool -- These collets are great for a wide range of applications, making them an essential accessory for CNC milling, lathe tools, and work-holding engraving machines. Description: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. Features:Made from high quality 65Mn spring steel, they are stable in performance.Fine workmanship, good elasticity, high precision and run-out tolerance is less than 0.008mm. Collet must be placed into collet chuck nut before inserting into collet chuck.Each collet is marked clearly so you can easily distinguish them.Great collet for CNC milling lathe tool and work-holding engraving machine. Specifications:Material: 65Mn spring steelModel: ER11Range: 4mm, 1/8", 6mm Height: 17mm OD: 8mmRun-Out Tolerance: <0.008mm Package Includes:3 x Collets Package List