... GB,ASTM,BS,or by client 2size:5/8"*12" 3grade:4.6,5.6,8.8,10.9 4Certificate:SGS ... 60---500 >> Shape of head: Hexagon head >> Grade: 4.6,4.8,5.6,5.8,6.8,8.8,10.9,12 ... License from the Ministry of Railways, P.R.China. 2.From 2006, we have manufactured the products of high ... Malaysia and Africa and so on. Pictures: 1. Certificate: 2. Various honorary certificates: 3. Product: Different types of twist spikes ...