I bought these furniture lifts because I'm handicapped. I was having a harder time standing up from my bed. I like they have a metal plate where the leg goes. Gives it a little more support. I use an electric bed. It came with wheels. These have small removable wedge inserts that go in on either side off the wheels to keep it from moving.My 85 year old mother spent so much time complaining about her sofa. Its SO low. I bought some for her. My teenaged niece put them under the legs for her. That's all you do. Lift up the corner. Place the lift. Done. Problem solved. My nieces and nephews dont sit so much as fall/flop into seats. They have survived the abuse. My mom is so happy. You would have thought what an elabotate thing I did. Want to be a hero? Get these for someone who needs them.