This is a Rixson-Firemark electromagnetic door holder set.
Some of the parts are plastic, and some metal. It has a dull aluminum color finish. It is 24 AC/DC volts.
It comes with a diagram instruction page to install this electromagnetic wall mounted door holder.
The magnet and wall plate are just under 4" and 2 wires are attached, the plastic protective covering is just over 4". The metal and plastic opposing piece is 2.75" x 2.5". It comes with all original pieces, hardware, and paperwork.
This set is new old stock. It comes to you in brand new condition, with some minor defects to the original packaging.