Detailed Product Description Hex Coupling NutsDiameters: 1/2" 6"Grades: A563 (Gr. A,B,C,D and DH), A194 grade 2HFinish:Plain,ZP, Black and hot-dip galvanizedProduct material: Carbon Steel, Alloy Steel, Stainless Steel, Copper, Nylon, Plastic, etc.Product intensity level: 4.86.88.810.912.9