Do not insert the drill hole cutter directly through the red positioning plate, 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 high-quality carbide, known for high hardness, resistance to deformation, and anti-corrosion properties. The hinge drill guide is constructed from durable ABS plastic, making it sturdy and portable. The 35mm Forstner drill bit features a center-positioned tip design for precise cutting. It includes a detachable depth-limiting stopper with clear measurement markings for easier and more efficient drilling. Tip: Ensure the drill chuck securely holds 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 quickly. The "V"-shaped locator aligns with a center reference line to precisely position drill points and prevent shifting. Simplifies cabinet door installation with improved accuracy. Suitable for use on wood, plywood, veneer, ideal for cabinets, furniture, mounting plates, and other DIY applications. User-friendly for beginners, allowing quick identification of hinge and mounting plate centers. Material: Plastic + Alloy Color: As shown Package Contents: 1 set x 35mm Forstner bit (3 pieces) Note: Light reflection and display differences may cause slight variations between the product color in images and the actual item. Measurement may vary by +/- 1-3 cm.