Ideal where in-ground anchoring devices are not appropriate. Tank style anchors have a 4-3/8" W x 3-1/4" H opening to fit over any round or flat rear crossbar. Hard plastic shell will not crack when filled in the field with 50 lbs of concrete, 39 lbs of sand or 24 lbs of water. Large carry handle and stackable design allow for convenient storage. Overall size 8-1/2" H x 12" W. Comes in bright yellow for visibility and safety. Please check ASTM counterweight requirements for your specific goal before ordering to ensure proper anchoring.