Carriage bolts Standard:DIN603 and American Type Size:M4-M30 Material: Stainless steel 304/316 Standard: DIN ANSI BS GBMeterial:steel,carbon steel ,stainless steelDia:5MM-20MM,1/4 ~3/4Length:8mm~200mm,5/16 ~8Surface treatment:PB,ZP,NP,CP,HG,OXPackaging:In bulk or boxes(by your requirment)