1.Prestressed hollow grouting anchor 2.Sheel expanshion anchor head 3.Diameter:25 ... 4.Used in good rock supporting self-drill hollow grouting anchorSpecificationsAnchor Bar R25,R32N,R32/18.5,R32S,R38N, ... 16,40/16S,40/20,52/26DingRun self drilling hollow grouting bolt 1)Business Type: Manufacture and sale2)The Length of ... with standard4)Package Details: Bundle Packing self-drill hollow grouting anchor