carriage bolt: 1)High tensity 2)Good quality 3)Effective service 4)Any specific fasteners can be provided carriage bolt:1). Standard: ANSI, DIN, BS, GB2). Material: Carbon steel, Stainless steel3). Color : black, zinc plate4). Diameter: 5mm-20mm ( 10' - 3/4' )5). Length: 8mm-20mm ( 3/8' - 12' )6). Grade: 4.8 , 5.8 , 8.8 , 10.9 carriage bolt