Furniture lifter with 4 pack 3.9"x3.15" furniture slider, heavy furniture roller move tools up to 150 kg/330 lbs, fits wood floor and tile floor instructions 1.put the lifter under to furniture and lift it up 2.let 4 pcs rollers into the 4 corners 3.remove the furniture lifter and let your furniture moved by 4 mover pad sliders