recessed hex head screw: 1,Size: M16*50,M14*45,M10*20 2,Material: 45# 3,Standard: DIN912-83 4,Finsh: zinc- ... of the product:1Materials: 45#2Size: M16*50,M14*45,M10*20 3Standard: DIN912-834Grade:8.85Surface: Zinc plated (Black, HDG, Dacron ... honorary certificates3.ProductsThe picture of size M16*50, M14*45, M10*20 is as following: 4.Factory view figures:PackagingFactory viewTesting equipmentsWorkshop ...