Xtratec ANKA-U
The ANKA-U is an in ground security anchor. It is designed to be concreted into the floor or pavement during construction, or set into a block of concrete, for example, in amongst pavers.

Instructions

Place duct tape over the openings to prevent concrete from getting inside during installation. Place in the ground so as the top will be flush with the surface when finished, then pour concrete. If placing in a block of concrete make sure the block is large enough not to be moved by a thief.