... DIN,GB,ASTM,BS,or by client 2size:5/8"*12" 3grade:4.6,5.6,8.8,10.9 ... 4Certificate:SGS Rail Timber Drive Screw Spike/5/8"*12" galvanized steel spiking >> Specification : DIN,GB ANSI/ASME ASTM, ... ,5.6,5.8,6.8,8.8,10.9,12.9 ( General and High strength) >> Surface treatment: plain, black ... being used. We exported to world markets, such as U.S.A., Canada, Cuba, Germany, Japan, Singapore, Malaysia and Africa ...