Zenken 4 Wheel Size Adjustable Retractable Furniture Dolly Roller Easy to Assemble, with 4 Locking Rubber Wheels (360  Rotation) 4 Sturdy PVC Corner Pieces 4 Thick Stainless Steel Rod 1100 lb Load Capacity Height: 4.7 inches, Maximum Width and Length: 27.5 & 27.5 inches, Minimum Width and Length: 17.7 & 17.7 inches