This is a Quarter blanking plate EFP-1/4BLANK for a RJ45 Ethernet network faceplate.
Ideal for capping of an excess slot or closure of an existing faceplate. You will need four of these blanks to fill a single gang faceplate or eight for a double faceplate. This blanking plate is half the width of a single RJ45 module.
Single gang (quarter) 50 x 12.5 mm