Compatible with all Dremel rotary tools.</br>For routing?? inlaying and mortising in wood and other soft materials. Use with Dremel?? #230 and #330 Router Attachments and #231</br>Made of high-speed steel.</br></br>Product Description</br></br>DREMEL 5/16 In. Keyhole Rou</br><br/>http://www.amazon.com/gp/product/B0006O8S0E