... ,hot dipped galvanized, PVC coated, etc. They are corrosion resistive and oxidation resistive.3. usage : used in industry, agriculture, building, transportation, mining ... 1/4"6.4mm x 6.4mm22,23,243/8" x 3/8"10.6mm x 10.6mm19,20,21,221/2" x 1/2"12 ... .7mm x 12.7mm16,17,18,19,20,21,22,235/8" x 5/8"16mm ... 19,20,211" x 1/2"25.4mm x 12.7mm16,17,18,19,20,211-1/2" x 1-1/2"38mm x 38mm14,15,16 ...