Classic Space-Saving Design: Classic square metal bunk bed frame suitable for various settings like children's bedrooms, universities, and vacation rentals. Durable: Sturdy square tube frame with weight capacity of 350 lbs for upper bunk and 400 lbs for lower bunk. Safety Features: Low height for easy climbing and worry-free sleeping. Reinforced fulll-length guardrails. Flexible Installation: Exchangeable ladder can be placed on either side for room layout customization. No Box Spring Needed: Features 22 sturdy metal slats while others 18-20 slats for strong mattress support without the need for a box spring. Easy Installation and Maintenance: Two-person installation recommended, takes around 1 hour. Mattress suggestions for safety and comfort included. Adam - Twin Over Full Metal Bunk Bed - Black - Metal76.69in L, 55.91in W, 54.09in H, and 72.82 lb Adam - Twin Over Twin Bunk Bed - Black Metal76.69in L, 40.94in W, 54.09in H, and 66.0 lb Adam - Twin Over Full Metal Bunk Bed - White - Metal76.69in L, 55.91in W, 54.09in H, and 72.82 lb