They are often used at bedtime and in order to allow them to be easily mounted and dethatched, a hook would be attached to a depression in the nageshi (beam running between columns) in traditional Japanese rooms.
就寝時に用いることが多く、簡単に取り付け、取り外しができるよう長押（なげし）のくぼみが鉤(かぎ、フック）をかけるのに利用された。