The HD-680 brass quadrant hinge is engineered with a built-in stop that allows a lid to remain open at 95°. The arc is mortised into the side of the box, beneath the leaf. The hinge is sold in pairs. Each leaf measures 1-1/2" x 1-3/4". Routing template TJ-680 and installation instructions are available. This part ships unassembled with a link connecting the two leaves. When assembling, the side with the pin will go into your lid.