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This is a 1/87th scale float bridge (transfer bridge) hinge, used on the shore side. This is a style used on Pontoon bridges, specifically the later, plate girder ones. It is designed to use either a piece of styrene as a pin, or a mico bolt, along the lines of 00-90 (not supplied)
10/9/16 - An 00-90 x 1/4" bolt works perfectly after ever so slightly enlarging the hole.