Introducing high-quality glides for table bases in restaurants and homes. Protect floors from table leg scratches. X-large 1.5-inch round bottom for durability and stability. Convenient side stripes for leveling on uneven floors. The thread 1-4 20 fits most US restaurant bases. Verify the thread with Thread Checker Board at Home Depot or Lowes. Simply screw your current base glide into a 1-4 20 screw hole and tighten. If you can achieve 5 turns or more, youve found the correct thread. If only 1 or 1.5 turns are possible, its not.