Definition of ring-bolt:
(n) :
(physical) A solid object in the shape of a circle.
(n) :
A circumscribing object, (roughly) circular and hollow, looking like an annual ring, earring, finger ring etc.
(n) :
(jewelry) A round piece of (precious) metal worn around the finger or through the ear, nose, etc.
(n) :
(UK) A bird band, a round piece of metal put around a bird's leg used for identification and studies of migration.
(n) :
(UK) A burner on a kitchen stove.
(n) :
A piece of food in the shape of a ring.