Non-slip: Non-slip flexible shaft. Fits directly into the chuck of any electric or cordless drill. Flexible shaft: Using an extension cord allows you to take your power tool into most places. Multi-purpose: can be used with polishing kits, drill bits, wire brushes, burrs, mounted stones and grinding wheels. Excellent quality: this flexible shaft extension and the perfect accessory to your drill. Works with Dremels tools and those from other brands. Lots of use: can be used with polishing kits, drill bits, wire brushes, burrs, mounted stones and grinding wheels. Features: Non-slip flexible shaft. Sander attachment for rotary tools.< /p> Suitable for electric grinders that can hold a 3.175mm shank. Inner diameter: 3.175mm. Outer diameter: 7.8mm (with chuck without M8 wrench). Note: Due to manual measurement, please allow 1-3cm error. Since the shooting technique , ambient light, display color and other reasons may cause the pictures to be slightly colored, please prevail in kind in the final color. becomeveryrich