1,STABLE OPERATION: The shaft joint has high concentricity, the accurate carving is not easy to shake, the operation is stable, and the safety is high 2,CONVENIENT CONNECTION: Support convenient connection, insert shaft of flexible shaft into electric grinder chuck core and fix 3,EASY TO REPLACE GRINDING HEAD: Easy to disassemble, insert a wrench into the main drive shaft of the jack card to loosen the chuck core and replace the grinding head 4,FOR MOST ROTATING TOOLS: Suitable for most rotating tools, such as most for Dremel power tools, grinders, engraving machines, mini drills, polishing machine tools, etc. 5,8000‑12000RPM MAXIMUM LOAD SPEED: The clamping range of the chuck is 3mm, the diameter of the joint is 6mm, and the maximum load speed of the flexible drive shaft is 8000‑12000rpm