The CW304-01X is a top-mounted cover accessory for Series 3, 4-terminal double-row terminal blocks. Constructed from 0.03-inch thick white vinyl, it provides physical protection and clear circuit identification. This cover measures 2.85 inches (Dimension A) by 2.49 inches (Dimension B) and is supplied with two nylon spring clips for secure mounting. The '01X' print style family indicates that markings are printed down the center line with a character size of 1/8 inch, aiding in circuit identification for installation and maintenance.