Used where you want a fully hidden hinge, these are machined from solid brass, have steel linkages, and open 180°.
Simply drill the appropriate sized hole, insert the hinge, and turn the set screw on the exposed face to wedge the hinge in position. For heavier load applications, a flat-head screw can be driven through the machined recess on the side opposite the set screw to further wedge and retain the hinge in place.
The barrel bodies are also toothed to provide an additional mechanical lock, or to allow for optional gluing.
Size given is the barrel diameter – use the same metric size for drilling. Prices given are per hinge.