Material is aluminum alloy no. 356 per spec. Qq-a-601 class 3m cond t6; finish is anodized black per mil-a-8625 type 2; 7.565 in. Long; housing contains four mounting holes, 0.192 in. Min. Dia. 0.200 in. Max. Dia.; next assembly is 81-0611; end item is 80-0128; used on flight command indicator