Black Terminal Block w/Stainless Steel 3/8" stud,Terminal Block w/Stainless Steel 3/8" stud Black, Flat washer : Stainless steel, Connection nuts : Stainless Steel, Spring washer : Stainless steel, Available material : Glass-Filled nylon,Full stainless steel stud, Black Terminal Block w/Stainless Steel 3/8" stud.