Dewalt dt4543 qz dewalt tct hinge boring bit 35mm dewalt dt4543 qz this hinge boring bit from dewalt is suitable for drilling cantilever hinges it has tct tungsten carbide tipped cutting edges for fast clean precise countersink hinge drilling the hexagonal shank facilitates a firm chuck grip while the boring bit is ideal for man made materials with abrasive resins dewalt dt4543 qz tct hinge boring bit 35mm