Application: Steel Stem Plastic Bed Frame Feet design for replace wheels, perfect for wood, carpet, tile and other hard or soft surface floors. Pop out your casters and pop these back in if you want to replace the wheels on your current bed frame. Measurements -3/8" Diameter Stem, 2 1/2" Wide at Base, Overall Height is 4", Installed Height is 2-3/4". Package as a set of 6 complete bed frame feet (6 tops, 6 bottoms, 6 plastic inserts). Color is black. Quality Guarantee, If there is any quality problem, please feel free to contact us. Refund or Replacement for any quality problem.