... and stud material: carbon steel, B7,SS Steel size: 1/4"~2",M4~M48 surface:plain, zinc plated, H.D.G,DAC ... ,B7, SS304 or SS 316,brass3) Size: M4-48,1/4"-2"4)SURFACE:ZINC ,HDG, PLAIN,HDG,DAC5)Thread:UNC ,UNF ,METRIC ... days or depend on the qty thread rod din975 class 4.8 zinc plated