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 5998-01-412-0340
NSN 5895-01-012-2202
NSN 6220-01-219-9670
NSN 6135-01-579-3534
NSN 5965-00-587-1916
NSN 5996-00-713-4013
NSN 5975-01-312-2136
NSN 7035-01-145-5059
NSN 5965-01-058-6285
NSN 5960-01-614-8005
NSN 5965-00-246-5612
NSN 5915-01-597-3387