Clear Block Cover Features Smaller Connecting Blocks For Use With Modular 66B Block Product Type Block Cover Resistance Properties Not Applicable Compatible with Grainger Part Number 6MJ66 Compatible with Manufacturer Model Number HPW66B36 Includes Mounting Screws Overall Depth 5/8 in Overall Height 12 3/4 in Overall Width 2 3/4 in Standards TIA-568C.2