Standard driving anvil or drive cap for 1 5/8 post sleeves. This goes between your sledge hammer and a post ground sleeve (2nd photo shows anvil inside sleeve).
This tool stops the end of a ground sleeve from mushrooming out when you hit the sleeve to drive it into the ground. We also have a heavier weight driving anvil for larger jobs; these standard anvils are great for jobs where you need to install less than 50 posts.
Note: this tool is unique and specific to our Critterfence ground sleeves - it is not designed for any other purpose - for example it will not help you drive 1 5/8 tube itself