This is a close-up of the lock on the door of the Ka’bah. Guardianship of the Ka’bah is entrusted to the Bani Shaybah (the Tribe of Shaybah) since an incident from the lifetime of the Prophet (ﷺ). The keeper of the Key of the Ka’bah is known as the ‘Sadin’.
Featured image: https://aboutislam.net/reading-islam/about-muhammad/the-story-of-the-kabah-key-holder-and-the-prophet/