The DEWALT Tungsten Carbide Tipped (TCT) Hinge Boring Bit is suitable for drilling cantilever hinges. The TCT cutting edges are for fast, clean, precise, and countersink hinge drilling. The hinge boring bit is ideal for man-made materials with abrasive resins. The hexagonal shank facilitates a firm chuck grip. They are suitable for drilling in hardboard, plywood, natural hardwoods, and softwoods. Specifications Diameter 35mm. Length 65mm. Fitment Hex.