Hook made from alloy steel, 4340 mod vac, melt 300m per mil-s-8844 class 3; handle, trigger and washer plates made from cres 17-7ph per ams5528; rivets and bushings p/n cres made from cres 17-4ph per ams5528; spring made from cres 17-7ph per ams5673; heat treat alloy steel per 270/300 ksi per bac5617, cres17-4ph, h900 per bac5619, cres 17-7ph springs ch900 per ams5673, cres 17-7ph th1050; finish per cadmium-titanium alloyplate per bac5804, cad plate per qq-p-416 type ii, class 2; trigger will remainclosed under uniform load of 6.75 pounds per square inch of its inner surface; capable of operating in a temperature environment of -60f to 300f; latch finish shall be skydrol resistant