The 4 hole - detent hinge is commonly used to connect plastic panels and doors to T-slot profiles. It holds doors open at 120 or 170 degrees and is especially useful in horizontal-lifting applications, as it provides hands-free access. It includes snap-on covers that hide the hardware to mount to a panel or profile as well as a detent hinge stopper and its mounting hardware. Important Caution: This hinge is not suitable for connecting multiple T-slot profiles.