Do not insert the drill hole cutter through the red positioning plate directly, as it is only used to mark the installation position of the hinge hole to locate the center. After marking, remove the positioning plate before drilling. The cutter fits into the plastic template hole. The hinge drill bit is made of premium carbide, known for high hardness, resistance to deformation, and anti-corrosion properties. The hinge drill guide is constructed from ABS plastic, making it durable and portable. The 35mm Forstner drill bit features a center-positioned tip design for precise cutting. It includes a detachable depth-limiting baffle and clear scale markings for easier and more efficient drilling. Note: The drill chuck should securely clamp the hole saw to prevent bit drift. Hole diameter of the red positioning plate: 35mm / 1.4 inches. The hinge drill guide helps accurately mark hidden hinge holes. The "V"-shaped locator aligns with a center reference line to quickly determine drill center points, preventing hole misalignment. Simplifies and improves accuracy in cabinet door installation. This concealed hinge kit is suitable for use on wood, plywood, and veneer surfaces. Ideal for cabinetry, furniture assembly, hinge mounting, and various DIY applications. User-friendly for beginners, enabling quick identification of hinge and mounting plate centers. Material: Plastic + Alloy Color: As shown Package Contents: 1 set x 35mm Forstner bit (3 pieces) Only the above items are included; other accessories are not part of the package. Note: Lighting conditions and display settings may cause slight variations between the image color and the actual product. Measurement tolerance: ±1–3 cm.