1.Finish: plain, zinc, blank and HDG 2.Thread: MM, UNC, UNF and BSW 3.Grades: 4.8, 5.8, 6.8, 8. ... 8, 9.8, 10.9 and 12.9 Carriage bolts DIN6031)Various kinds of bolts available2 ... (5/16 to 8-inch)4)Thread: MM, UNC, UNF and BSW5)Can be made with different tensile strength, such as ... ,6.8, 8.8, 10.9 and 12.9, inperial grade 2, 5, 8 and 106)Can be supplied with different finish ...