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 is made of premium 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 baffle and clear scale markings for easier and more efficient drilling. Tip: Ensure the drill chuck securely clamps 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 concealed hinge holes quickly. The "V"-shaped locator aligns with a center reference line to precisely position drill points and prevent shifting, ensuring accurate cabinet door installation. This concealed hinge kit performs efficiently on wood, plywood, and veneer, ideal for cabinetry, furniture, hinge mounting plates, and various DIY applications. Suitable for beginners, it allows quick identification of hinge and mounting plate centers. Material: Plastic + Alloy Color: As shown Package Contents: 1 set x 35mm Forstner bit (3 pcs) Note: Light reflection and display differences may cause slight color variations between the image and actual item. Measurement may vary by +/- 1-3cm.