Used for edging and grooving wood, Dremel router bits are ideal for routing, inlaying and mortising in wood and other soft materials. V-Groove Router bits are used for cutting chamfered edges and for various types of decorative carving. The 640 V-Groove bit features 1/4 In. (6.4 mm) cutting diameter. Can be paired with the Dremel 231 Shaper Router Table or the Dremel 335 Plunge Router attachments.