The 100mm x 100mm powapost concrete in post shoe is designed to help you install your garden fencing easily and quickly this post shoe is designed to be set into concrete so it can act as an anchor for fence posts traditionally fence posts are set into concrete but this can cause problems when the fence post needs to be changed due to damage or rot with this post shoe you can easily change broken or rotting fence posts because the post is not set into the ground just the supporting shoeto u