SECURIT STEEL BUTT HINGES POLISHED CHROME PLATED 75MM
A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation. Hinges may be made of flexible material or of moving components.
Butt hinge! susually in threes or fours, which are inset (mortised) into the door and frame.