SHUT IT's CI2051 Round Bolt-on BadAss Gate hinge (*sold per piece) is ideal for mounting square frame gates to round pipe and tube posts. The round hinge is adjustable and clamps over the outside of a round 4" outside diameter post. Hinges have an adjustable gap variance that allows them to mount in a 2.7inch to 3.2" opening. Hinges are rated for a maximum gate weight of 1,000 LBS and feature the legendary maintenance free sealed bearings, from Shut It Gate Hardware.