High Quality:Concealed hinge jig is made of premium steel ,Perfect for standard 35mm concealed hinges,Especially designed to drill a hole on the door or desk gently and efficiently. Jig Drill Guide Set: The hinge jig can be adjusted for changes of door edge ,remove the dirty and debris quickly.This drill set is perfect for concealed hidden hinges and door locks. Forstner Bit Positioner: The blue positioner can help you fix the place where you need to drill holes ,which can better to install it effeciently quickly. Package Included:1 *35mm Hinge Boring Jig,1 * Forstner Bit Positioner and 1 * Cutting head. Widely Application:Working efficiently for various drilling machines, such as drill press, gun drills,pistol drill, bench drill, vertical electric drills and so on.