We offer back stroke turning indicators, which are procured from the leading manufacturers. The backstroke turn indicator posts should be installed 5 meters from each end of the pool and backstroke flags should be between 1.8m and 2.5m above the water. The posts slide into posts sockets that are core drilled and fixed into the concourse. specifications : height 1.8m, stainless steel, diameter 3.8mm, with bayonet locking base, supplied with backstroke flags and fixing anchors.