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 5910-01-622-3590
NSN 5985-01-278-9121
NSN 6105-00-352-9481
NSN 6220-01-500-4516
NSN 5945-00-149-9354
NSN 4140-00-608-5654
NSN 2925-01-424-0235
NSN 6110-01-449-0150
NSN 6145-01-477-9541
NSN 6610-01-140-3634
NSN 5945-00-069-9918
NSN 5925-01-303-6057