Limited Quantity Special Deals INCRA Systems use router bit geometries that are widely available, so there are literally dozens of sources for compatible bits. However, the quality of the router bits you use will be a big factor in the results youll get. American-made Whiteside bits are as good as youll find, earning #1 ratings in both of the past two Fine Woodworking Magazine router bit comparison tests (May/June 2007, August 1999). All bits are two-flute, carbide tipped models with 1/2 shank size. HingeCrafter Set Each wooden hinge requires a full-radius bullnose bit to shape the hinge barrel and a similarly-sized straight bit to cut the mating halves of the hinge. This set contains all of the bits necessary to produce wooden hinges with 3/8, 1/2, 5/8, and 3/4 barrel diameters.