This is a simple door stop that I added ½" PVC threaded fittings to so that I could have a stick and wouldn't have to bend over 20 times a day to pick it up.  There are male and female threaded versions, whichever you have the right fitting for.  It has some grip on the bottom that makes it grip a little better to the concrete I have it on, and also acts as sacrificial material for it to grind against the floor.