For routing, inlaying and mortising in wood and other soft materials. Use with Dremel?? #230 and #330 Router Attachments and #231 Shaper/Router Table. Made of high-speed steel. Ideal for routing, inlaying and mortising in wood and other soft materials For use in wood and other soft materials Use with Dremel?? #230 and #330 router attachments and #231 shaper/router table Made of high-speed steel BIT DIAMETER INCH: 1/4" BIT DIAMETER MM: 6.4 mm CUT TYPE: V-Groove