One post, cap and sleeve 10 ft finished height (3 parts to make one completed support post 10 feet above the ground).
This post has a removable or permanent 4ft extension set in place with a self tapping screw.
The sleeve includes a locking set screw. The sleeve goes into the ground, the cap on the post then the post slides inside the sleeve - the set screw holds the post inside the sleeve.
These single post, cap & sleeve assemblies are available for purchase in quantities of 4 or more.