Features: Product Size: Drill diameter: 21 mm/0.83 inch, hexagonal shank diameter 10 mm, drilling depth 60 mm, total length 86 mm. Positioning drill and blade are made of YG8, hardness ≥ 91HRA, bending strength up to 2200 N/cm², can be reground. The shank rod is made of No. 45 steel, heat-resistant and corrosion-resistant. After hardening, the hardness is extremely high, which effectively prevents the shank from bending during use. 2 mm super thick blade: Uses an industrial-grade YG8 blade, which extends the lifespan by 10 times compared to 1.3 mm thick blades. The woodworking hole saw is perfect for wood, plastic, plywood, solid wood boards, plastic, furniture, door hinges, desks. Cannot drill into metal. The drilling process must be kept vertical, and it is recommended to use a tool such as a vise to hold the material stable so that an even hole of precise size can be obtained. Adjust the slow drilling speed until the drill is fully in position, then gradually increase the speed. The speed is controlled at 2200~2500 rpm for better effect. Specifications: Component: Stainless Steel Size: Approx. 94x21 mm/3.7x0.82 inches Note: 1. Please allow 1-2 cm errors due to manual measurement, and make sure you do not mind before ordering. 2. Due to differences between different monitors, the picture may not reflect the actual color of the product. Package includes: 1 x Wood Drill Bit