The Atlas Outdoor Sign Holder is designed to hold rigid signs. Easy to setup and store, multiple Atlas Sign Holders can be used to showcase a large rigid graphic. The plastic base can be filled with water or sand for additional counter weight. Includes three ground stakes. Use as many Atlas bases as necessary to hold a large rigid graphic 0.4 - 0.5" thick. Recommended graphic substrates: 10mm corrugated plastic or 1/2" rigid substrates. Base only.