Spring-loaded self-leveling glides automatically adjust to uneven floor surfaces & eliminate table wobble. 1/4-inch x 20 threaded stem screws directly into female threaded furniture legs or 1/2-inch plastic inserts (included) that can be installed into wooden legs. Glides can be further outfitted with 1-inch felt or high density poloyethylene self-adhesive pads (included) for smooth sliding performance on hardwood, tile, or carpet. Each glide supports up to 35-lbs and compresses up to 1/4-inch to compensate for uneven floor surfaces or other leg-to-leg variance. 4-Pack set includes 4 self-leveling glides, 4 wood leg inserts, 8 self adhesive pads for hard surfaces or carpeting, and a hex wrench for secure installation.