A releasable locking hinge assembly having: a shaft including a first locking region with faceted sides on an outer circumference of the shaft, and a partial or complete hollow cylinder coaxial with and receiving the shaft, wherein the hollow cylinder includes a second locking region with faceted sides on an inner wall of the cylinder, wherein the first locking region and second locking region are configured to slidably engage; and wherein the locking regions slidably engage, they lock the angular position of the locking hinge, and where they slidably disengage, they allow the locking hinge to pivot.