Matt is monel
A rigid or flexible item of various shapes attached to a structure for the purpose of providing access for inspection, service, replacement of components and/or adjustments or mounting operations. It is designed to be attached by means of bolt holes, slots, mounting ears, tabs, and the like. To permit access, the mounted cover requires partial or complete removal. It may include an observation window. For items permanently attached by hinges and the like, see door, access (as modified). Excludes all covers not specifically designed to provide access for the purposes listed above.
Classification: Other articles of iron or steel not wire nesoi
NSN 6110-01-570-8575
NSN 6135-01-449-0625
NSN 5945-01-592-8566
NSN 5920-00-397-0802
NSN 2925-01-516-5113
NSN 5996-00-288-1829
NSN 6110-01-186-0010
NSN 6240-00-170-5302
NSN 5975-00-141-0449
NSN 5855-01-415-3987
NSN 4140-01-633-4965
NSN 5925-01-067-8301