Enclosure, brass, size 2-1/8 x 4-1/2 x 2-1/4" deep (inside dimensions). Submersible to 15 feet. Used for a number of standard "Symbol" items. Its relatively small size makes this enclosure useful for various assemblies needed to fit close quarters. Normally furnished empty. Can be modified to include mounting plates, brackets, etc. to suit your requirements. If a smaller size is needed, see the part number M24142/9-001 which is 2-1/8 x 3 x 2-1/4". This assembly is military part number M24142/10-001 per MIL-E-24142/10. The NSN is 5975-01-278-9821.