Features: Engineered with hexagonal shank design, this 5 piece Forstner bit set delivers precise flat bottom holes (15-35mm) in woodworking projects while maintaining slip resistant stability in power tools. The adjustable depth collar and wing styles cutting edges enable clean hinge installations and efficient wood chip removal, crafted from hardened alloy steel for extended durability across multiple drilling applications. Ideal for professional DIYer enthusiasts requiring accuracy in cabinet hardware mounting, door lock installations, or furniture fabrication with standard wood materials. Perfect for creating recessed joints in tabletops, drilling shelf pin holes in bookcases, or preparing concealed hinge cavities for kitchen cabinet doors and architectural woodwork. Each Forstner drill bit features markings and heat treated construction, ensuring consistent performances when working with hardwoods, plywood in workshop environments. Specifications: Component: Metal. Size: 81x35x35mm/3.18x1.37x1.37inch Weight: 432g. Specifications: 15mm, 20mm, 25mm, 30mm, 35mm. Package Includes: 5pcs Wood Boring Bit note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.