I would not recommend them for a hollow leg. I would try to cap the leg and then secure a 1 1/2 inch slider to the cap. It will depend on what the table is sitting on, tile, stone or carpet. Also if this is indoors or outside. If outside I'd want something that screws to this cap since the weather may break down the sticky tape on the sliders.
The thickness is 0.375 inches.
We have them set at a 75-lb load capacity per glide.
These are self-adhesive. Or they can be screwed in place.
These would probably work better on concrete. http://www.homedepot.com/p/Everbilt-1-1-2-in-Plastic-Insert-Patio-Cups-4-per-Pack-43040/203660655?keyword=plastic+insert+tips