... steel, size: 1/4"~2",M4~M48 surface: DAC, GOMET zinc plated studs 1) Standards: DIN & ANSI & JIS 2) Material: carbon steel ... SS 3163) Size: M4-48,1/4"--2"4)SURFACE:ZINC ,HDG, PLAIN5)Thread:UNC ,UNF ,METRIC 6) Quality control :ISO ... Union 9)Delivery: 30 days or depend on the qty zinc plated studs