Easy replacement of the grinding head: It is easy to disassemble the key in the main drive shaft of the jack plate and loosen the chuck core to replace the grinding head. Easy connection: Allows easy connection, insert the shaft of the flexible shaft into the core of the electric grinder chuck and secure 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: Allows for easy connection, insert the shaft of the flexible shaft into the chuck core of the electric grinder and fix it. Maximum load speed 8000-12000 rpm: the chuck clamping range is 3mm, the diameter of the joint is 6mm, the maximum load speed of flexible drive shaft is 8000-12000rpm. Note: The data are all measured manually, please allow error 1-3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.