1.standard DIN603 2.different head type is available Carriage Bolt with PinMaterial by steel galvanized or stainless steel.Standard: DIN603Dimension according to standard or customs designSize from M4-M100 length 30-100mmMetric and SAE size is availableDifferent surface finish is available Class 6.8, 8.8, 10.9, 12.9Customs design welcome!