Mil-s-18728 mil spec 1st material response and mil-s-18729, comp 4130 mil spec 2nd material response
Mil-s-18728 mil spec 1st material response and mil-s-18729, comp 4130 mil spec 2nd material response
Mil-s-18728 mil spec single material response band or mil-s-18729 mil spec single material response band