MRC:
The specification,standard,or manufacturers reference,and the classification designation,such as class,condition,temper,and the like,that identifies the material.MDCL
Material Specification:
Mil-s-5059, type 301, cond 1/4 hard military specification single material response or mil-s-5059, type 301, cond 1/2 hard military specification single material response or mil-s-5059, type 301, cond full hard military specification single material response or mil-s-5059, type 302, cond 1/4 hard, finish 2b military specification single material response