This is a genuine OEM 3-inch add-on leg kit for the Reverie R400HT, R450HT, R500L(9T), R600, and R650, and Serta Motion Select Extra Height Leg Kit (4 Legs Total) (Not the R400/450 non-pillow tilt model, view our other listing) this will raise the platform leg to the tallest height recommended by the manufacturer. These are model specific and may not work with other models or brands. Most orders arrive to your home within 5 days unless you choose 3 Day Priority or 2 day express shipping at checkout.