Tungsten Carbide Tip (TCT) Tungsten carbide is about twice as stiff as steel with a Young's modulus of about 530閳00 GPa (77,000 to 102,000 psi) and twice the density of steel, halfway between that of lead and gold . Its hardness is comparable to corundum (浼Al2O3). Specially designed for cleanly cutting holes in end grain and fine material, the tungsten carbide tip is ideal for drilling concealed hinges and door locks. CURVED DESIGN With the curved design, the head effectively removes dirt and works efficiently. Features閿?1. The Forstner bit drills clean holes in soft and hard wood. 2. Two spurs and a center point provide the perfect solution for repeated, clean and precise hole cuts. 3. Pointed center spur locates the exact center of your hole. 4. For drilling precise, flat-bottomed holes without chipping in soft wood of any thickness. 5. For drilling holes in any direction and making arched openings. For drilling partially overlapping flat bottomed holes for easy prying. 6. Must be