A machine screw anchor is your best bet for repeated removals and reinstallations. They're also available in standard thread sizes, so they can accept machine screws, eye bolts, or hook bolts.



A lag shield anchor may be another acceptable option, but it is not as "reusable" as a machine screw anchor. It creates a sleeve inside the hole in your concrete with threads for a lag screw to grab onto. When the lag screw is inserted, it expands the shield inside the hole.

The installation process:

 - Drill appropriately sized hole with a hammer drill and masonry bit
 - Remove concrete dust
 - Tap lag shield anchor into hole
 - Insert lag screw into lag shield and tighten

![enter image description here][1]

The lag screw will still be removable, but keep in mind that many repeated removals and installs may eventually weaken the anchor.

[Image Source][2] (I have no affiliation with this distributor, they just had good illustrations.)


  [1]: https://i.sstatic.net/l5hly.gif
  [2]: http://www.strongtie.com/products/anchorsystems/mechanical/screw-anchors/lses.html#