Increased Mobility for Carpeted or Rug Covered Floors Bed frame wheels allow you to move your bed more easily, and the wide rollers protect your carpet. Use on carpeted floors or floors with rugs. Not recommended for use on hardwood flooring. Replace Damaged, Broken, or Missing Wheels Replace damaged, broken or missing wheels. Features a standard Grip-Neck socket to easily attach to your bed frame. For Use with Bedframes These rug savers are designed for use with bed frames. They have a 3/8" x 1-9/16" Grip Neck socket stem. Wheels are black. Plastic Plug Inserts Plastic Plug Inserts are optionally available by selecting them at the right. These plastic inserts are made to be inserted in your bed frame to facilitate the correct fit for your casters. The price of the plastic inserts will be automatically discounted in the cart if purchased together with these wheels. Sold Singly These casters are priced "each", so a quantity of 2 will yield two casters.