51586. Carbide Tipped Convex Edging 23/32 Radius x 29/32 Dia x 1-1/4 x 1/2 Inch Shank. 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. Not for use in CNC machines.