The M85049/1811W03 is a straight environmental EMI/RFI backshell providing strain relief and protection for cable terminations on MIL-DTL-38999 Series III & IV connectors. Constructed from aluminum alloy with a cadmium olive drab finish, it features a spin coupling mechanism for secure installation. This backshell corresponds to accessory shell size 11 and clamp size 03, accommodating a cable diameter range from 0.25 to 0.38 inches. Its robust design offers excellent EMI/RFI shielding and environmental sealing, making it suitable for harsh military and aerospace environments where signal integrity and reliability are paramount.