8mm Shank - Double Edging - Cove Box Router BitsCore box bits route a half round groove with little to no sanding required. The center meeting carbide blades ensure a perfectly smooth finish every time. These bits are great for routing channels in cutting boards and long flutes in solid wood. These bits are available in a variety of diameters, each with a generous cutting length to help achieve the full half round depth. The blades are C3 micro grain premium carbide. Specifications: Item: 8mm Shank