... ,GB,ASTM,BS,or by client 2size:5/8"*12" 3grade:4.6,5.6,8.8,10.9 4Certificate:SGS Rail Timber Drive ... >> Grade: 4.6,4.8,5.6,5.8,6.8,8.8,10.9,12.9 ( General and High strength) >> Surface treatment: plain, black, zinc, electro galvanize ... spikes(Zinc-plated, HDG, Black): 4. Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome your visit! Railway 5/8"*12" galvanized steel twist ...