TIMBERLINE by Amana 350-40 TIMBERLINE CONVEX EDGING 1/2 Shank 2 Flute Cuts a shallow arc'the fingernail shape'rather than a full 180-degree roundover. Like the bullnose radius bit, it has short flats above and below the cutter arc, which produce fillets on stock thicker than 7/8". Must be used with an edge guide on handheld routers or the fence on a router table.