Flex Shaft Rotary Tool Kit with Drill Extension Cable Attachments for Engraving Grinding Polishing Flexible Shaft Rotary Tools, Flexible Drill Extension Cable Chucks, Flex Shaft Accessories for Engraving, Grinding and Polishing 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.