Speaker Rear Cover Features Hide and Protect Speakers For Use With 5 to 7 in Speakers Product Type Speaker Back Cover Includes Not Applicable Compatible with Manufacturer Model Number MA4054 MA4055 MA4056 MA4600 MA5104 MA8506 Compatible with Grainger Part Number 39DN66 39DN67 39DN80 39DN81 39DN84 39DN85 39DN87 39DN88 39DN89 Compatible with Series Universal Material Plastic Overall Width 8 1/2 in