Posts are available in Treated Softwood and Oak in the following width x depth:
4 x 4 (100x100mm), 5 x 5 (125 x 125mm), 6 x 6 (150 x 150mm), 7 x 7 (175x 175mm), 8 x 8 (200 x 200mm)

And heights:
5’ (1525mm), 6’ (1830mm), 7’ (2130mm), 8’ (2440mm), 9’ (2740mm)
NB. All 4x4 (100 x 100mm) posts are square ended, all other 2 w/w tops standard.