TUNGSTEN CARBIDE TIP (TCT) Tungsten carbide is approximately twice as stiff as steel, with a Young's modulus of approximately 530700 GPa (77,000 to 102,000 psi), and has nearly double the density of steelfalling between that of lead and gold. It is comparable to corundum (-Al2O3) in hardness. The tungsten carbide tip is specially designed to cut clean holes in end grain and thin stock, ideal for boring concealed hinges and door locks.DESIGN WITH CURVE The curved design efficiently removes debris and enhances performance during operation.Features: 1. Forstner bit drills clean holes in soft and hardwood. 2. Two spurs and a centering point ensure consistent, clean, and accurate hole cutting. 3. The sharp center spur precisely locates the center of the hole. 4. Drills precise flat-bottom holes without chipping in soft wood of any thickness. 5. Suitable for drilling in any direction and creating arched openings. Can drill partially overlapping flat-bottom holes for easy mortising. 6. Designed for use with a power drilling machine.Please Note: 1. The Forstner drill bit is designed to operate in a clockwise direction only and is not reversible. Begin drilling at low speed and gradually increase. 2. Maintain the cutting edges by sharpening when necessary to prevent chipping or damage, as broken tips may significantly reduce drilling accuracy and quality.Specification: Product Name: Forstner Bit Material: Tungsten Carbide Tip (HRC 70) & Carbon Steel Body Package Options: 5 pcs set: 15mm, 20mm, 25mm, 30mm, 35mm 11 pcs set: 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mmSize Chart: | Size (D) mm | Overall Length (L1) mm | Shank Dia. (d) mm | Shank Type | Shank Length (L2) mm | Cutting Depth Max. mm | |-------------|------------------------|-------------------|------------|------------------------|------------------------| | 1525 | 80 | 8 | Round | 22 | 55 | | 2635 | 80 | 8 | Round | 22 | 55 | | 3845 | 80 | 9 | Round | 22 | 55 | | 4855 | 80 | 8 or 9 | Round | 22 | 55 | | 6065 | 80 | 9 | Round/Hex | 22 | 55 | | 70100 | 80 | 8 | Hex | 22 | 55 |