Universal Outdoor Support Plates Beach or Grass Setup Either Location Fits a Pole Outside Pole Diameter of 1.625-inch or Less Extra Thick UV Treated Plastic Made in the USA Set of two plates that will prevent poles from sinking into the sand or grass. A pair of square base plates with a approximate size of 7-7/8-Inch by 3/8-Inch thick. The plastic is UV treated marine grade black polyethylene. Each plate has a flange hole for your volleyball poles to rest in. We offer two sizes that should fit your volleyball poles. If you need a different size just contact us and we will be happy to manufacture your custom size.