... ,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 ... of head: Hexagon head >> 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 ...