1. Standard: DIN, ANSI, BS, ISO,JIS 2. Material: Carbon steel ,Stainless steel 3. Size: M6 to M20 1/4" to 3/4" Carriage bolts DIN6031)Various kinds of bolts available2)Material:carbon steel, stailess steel3)Diameter: 5 to 20mm (1/4 to 3/4-inch) Length: 8 to 200mm (5/16 to 8-inch)4)Thread: MM, UNC, UNF and BSW5)Can be made with different tensile strength, such as Class 4.6, 4.8, 5.6, 5.8,6.8, 8.8, ...