Router Bit for Binding Carbide-tipped! For routing binding channels, the carbide tips stay sharp longer than steel. Small diameter is ideal for tight curves, too. Binding router bit for Dremel & Foredom tools. Cutter diameter 5/16" (7.94mm) Shank diameter 1/8" (3.18mm) Cutting height 3/8" (9.52mm) Use this bit with our Binding Router Guide when routing the edges of archtop instruments, where a standard router base won't work.