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 hole. After marking, remove the positioning plate and begin drilling. The cutter fits into the plastic template hole. The hinge drill is made of premium carbide, offering high hardness, resistance to deformation, and corrosion resistance. The hinge drill guide is made of ABS plastic, 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 a clear scale for easier and more efficient drilling. Tip: Ensure the drill chuck securely clamps the hole saw to prevent bit drift. Hole diameter of red positioning plate: 35mm / 1.4 inches. The hinge drill guide helps quickly mark accurate hidden hinge holes. The "V"-shaped locator aligns with a center reference line to precisely locate drill center points, preventing hole misalignment. Simplifies cabinet door installation with accuracy. This concealed hinge kit is suitable for timber, plywood, and veneer applications, ideal for cabinets, hinges, furniture, mounting plates, and other DIY projects. Easy to use for beginners to quickly locate 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 variation between the image and the actual item. Measurement tolerance: ±1–3 cm.