china factory. best price,good quality (1).Product name:Carriage bolt(2).Standard:DIN,ANSI603(3).Size:M5-M20;1/4"-1/2"(4).Material:carbon steel(5).Length:12-300mm,1/2"-10"(6).Grade:4.8 6.8 8.8 (7).Finish:Plain,zinc,black,nickel,H.D.G,brass plating,silver plating(8).Certifications:ISO 9000/9001/9004/19011:2000 carriage bolt