Easy replacement of the grinding head: To replace the grinding head, the key in the main drive shaft of the jack plate can be easily removed and the chuck core can be loosened. Easy connection: Allows for easy connection, insert the shaft of the flexible shaft into the core of the electric grinding chuck and secure it. Suitable for most rotary tools: Suitable for most rotary tools, such as most Dremel power tools, grinders, engravers, mini drills, polishers, etc. Easy connection: Allows for easy connection, insert the shaft of the flexible shaft into the core of the electric grinding chuck and secure it. Maximum load speed 8,000–12,000 rpm: The clamping range of the The chuck diameter is 3 mm, the joint diameter is 6 mm, and the maximum load speed of the flexible drive shaft is 8000-12000 rpm. Note: The data is all measured manually, please allow 1-3 cm error due to differences in lighting and display, there may be color differences, please refer to the actual object received.