10 to 16mm Galvanised Hammer-on Beam Clips - Pack of 100 Please note, once installed, the clips are virtually impossible to remove, please ensure that you have measured correctly. Where to Use For use as an intermediate netting perimeter wire rope fixing when installing bird control netting on structural steel beams, columns and roof trusses Can also be used when installing netting to tiled roofs, use the clips for the edge of the tiles. Product Specification Galvanised Steel. Available in sizes between 2mm and 20mm. 6.5mm hole in the clip for threading wire rope. How to Install Bang onto the flange of the girders at 1m intervals for 75mm and 50mm netting and 0.5m intervals for 28mm and 19mm nets.