Feature: 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 Specification: Item Type: Flex Shaft Adapter Attachment Material: Rubber + ABS Purpose: Suitable for most rotating tools, such as most for Dremel power tools, grinders, engraving machines, mini drills, polishing machine tools, etc. Chuck Clamping Range: Approx. 3mm / 0.12in Joint Diameter: Approx. 6mm / 0.24in Flexible Drive Shaft Maximum Load Speed: 8000-12000rpm. Package List: 1 x Electric Grinder Flexible Shaft1 x Wrench Note: It is forbidden to bend at acute angle and near angles. Try to bend naturally. The maximum radius of the flexible shaft spring axes shall not be less than 3.5CM. If the radius is smaller than this radius, the spring rebound range will be exceeded. After the spring is deformed, it will seriously rub against the tube wall, cause jitter, and reduce the service life.