1、Wide Application: This mill collet is widely used in machining centers, general grinders, CNC grinders, engraving machines, high speed machines and other machining. 2、Good Compatibility: This mill collet is suitable for all kinds of grinders to hold grinding heads, suitable for repairing and grinding tires. It is compatible with most rotary tools used in hardware, hobbies, home and CNC lathe, tooling and work holding engraving machine. 3、Accurate Grinding: This mill collet is accurately ground with a total runout of less than 0.0003, so it won't come off easily when in use. 4、Excellent Spring Steel: This mill collet kit is made of excellent spring steel, which is strong and wear resistant with stable performance. 5、Multiple Sizes: This mill collet kit has three different sizes to meet your different needs, you can choose to use it according to the situation.