Most speaker stands over 15" high look like they are likely to tip over with speakers weighing over 2 lbs. The stands offered here are steady even with the heaviest bookshelf speakers. Center pillar is 5" X 2.5". Each stand weighs 16.2 lbs. Top plate 8" X 9". Bottom plate 10" X 12". Base has spikes for stability on carpet. Respond by email or phone 801 487-3047