Easy Replacement of Grinding Head: It is easy to disassemble the wrench in the main drive shaft of the jack plate and loosen the chuck core to replace the grinding head. Easy Connection: Provides easy connection, insert the flexible shaft shaft into the chuck core of the electric grinder and fix it. Suitable for Most Rotary Tools: Suitable for most rotary tools, such as most Dremel power tools, grinders, engravers, mini drills, polishing machines, etc. Easy Connection: Provides easy connection, insert the flexible shaft shaft into the chuck core of the electric grinder and fix it. Maximum Load Speed 8000-12000RPM: The chuck clamping range is 3mm, the diameter of the joint is 6mm, the maximum load speed of the flexible drive shaft is 8000-12000rpm. Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.