it will be apparent that while in the illustrated embodiment the retainer member 30 engages the walls of the body portion 11 it may be feasible to utilize an encircling member that fits tightly only around the outermost flange edges thus the retainers may be of the same circular or triangular configuration as the walls of the cap retainers shown in fig2 b and 2c or may be of still other configurations that will encircle the post while fitting tightly against the outermost edges of all projecting flanges in fig3 the flanges 30a and 30b of the pole 30 are curved rearwardly and swept back from their junction with the rearwardly extending flange 30c the curved configuration of the flanges 30a and 30b like the swept back angled flanges 11a and 11b shown in fig1 allows strung wire to be somewhat misaligned without applying so much torque to the post that a flange is sheared similarly also the curved configuration of flanges 30a and 30b will allow barbs on the post without applying so much pressure to the flanges that they shear as shown best in fig6 a driver tool for use in driving the post 10 into the ground is shown at 35 the driver tool 35 includes a cylinderical housing 36 having one closed end 37 and an open end 38 a pair of handles 39 and 40 may be positioned at.