jump rings
steel towers
If you're talking about the "silver" circles in the banner, those are called grommets. They are "grown up" versions of the metal circles in gym shoes that you thread your laces through. Grommets are installed with a tool similar to a hole punch only over the "punch" you slip the grommet; when the tool is closed, the hole is punched and the grommet is inserted and compressed.
transmission line tower
The metal support used in a fireplace is called a "fireplace grate." It is placed inside the fireplace to hold logs and allow airflow for a better burning fire.
A pandora bracelet in a very expensive and beautiful bracelet. A pandora bracelet is a completely custom built bracelet that you pick yourself, you can add as many charms as you like.
Epoxy itself is glue that will hold to metal.
They are called bumpers. 3M calls its product Bumpon.
There is more than one way to hold metal in place - it can be welded, clamped, glued, etc. - but you are probably thinking of a vice.
The forces which hold a metal together are called metallic bonds. They consist of delocalised electrons which bind all the atoms together.
A clutch, but more commonly referred to as 'damn-its'.
Yes, when data is stored on a disk, it is organized into concentric circles known as tracks. Each track is divided into smaller units called sectors, which hold the actual data. This structure allows for efficient reading and writing of information as the disk spins and the read/write head accesses the data.
The metal piece that fastens the handle to the tang is called a rivet. Rivets are permanent mechanical fasteners that hold the handle securely in place on the blade of a knife or tool.