The flexible pen body and the smooth metal surface make engraving, sanding and polishing easier and more comfortable, especially suitable for long-term use.The bending extension of the handle does not need to match the specifications of the electric grinder interface. As long as your electric grinder or electric drill can be clamped on the size of 3.175 mm, you can connect the flexible shaft.The flexible shaft is convenient and simple to install, just clamp the connector handle on the electric grinder.The flexible shaft connector needs to be connected by an electric grinder. (This flexible shaft does not have a machine, please choose another machine).The flexible shaft of the rotating tool can be used for polishing kits, drill bits, wire brushes, countersunk heads, flip wheels, mounting stones and grinding wheels.Grinding head: head diameter 6mmx rod 3mmColour: Gold / SilverMaterial: aluminumPackage Contents:10 x double-grain rotary file grinding heads1 set x flexible shaft adapter accessoriesNote: The wrenches are shipped in random styles(, don't accept the specified), and the usage is the sameOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.