I have two USED concrete fence posts for sale.
They are 100mm square, 2.4m (8') total height, and have three rectangular through slots designed to accept Arris ('featherboard' fencing) horizontal support bars.
They have flat tops with a flat indent on one side (parallel to the Arris bar holes).
All old foundation concrete has been chipped off, so they are ready for re-use.
BUYER COLLECTS - they are HEAVY!!!