[Material] The Drill Bit Is Made Of Super Hard Alloy, Sharp And Smooth. The Hinge Locator Is Made Of Abs Plastic.[Dimensions] The Hole Diameter Is 35Mm, The Total Size Of The Locator Is 77 X 66Mm And The Total Size Of The Hinge Hole Is 80 X 35 Mm.[Concealed Hinge Drilling Tool] The "V" Locator Protruding From The Center Of The Reference Line Can Quickly Locate The Center Point Of The Drill Bit. All Hinges And Mounting Plates.[Precise Hole Position] The Hinge Positioner Has Precise Hole Positions. The Hole Is Fixed And Not Easy To Move. The Hole Opener Has A Scale To Help You Locate It Accurately When Installing.[Multiple Use] Suitable For Drills, Bench Drills, Vertical Drills , Etc. All Wood And Wood Products, Plastics, Plywood And Other Materials You Need Are Extremely Perforated, Suitable For Industrial Hinge Installation, Wood Processing And Maintenance, Model Making, Etc.