FB-39 Split Set Bolt is primarily used for securing strata mesh by installing into existing 47mm friction bolts in conjunction with a smaller plate. Longer lengths are also used as primary ground support when drilling small diameter holes. Our FB-39 Split Set Bolt was made by high strength steel strip which special refined with very low level of Si & P in chemical components, it will make the bolt in perfect performance of supporting rocks, and help to have a good quality in galvanizing. Meanwhile, with our advanced PLC-controled auto welder, the bolt will has a very good performance when it is inserted in the rocks.