The Large LevelDry Swing Set Leveling Block is a product designed to keep swing sets level and safe for children. It is made out of 100% recycled rubber and proudly made in the USA. It measures 7″ x 7″ x 1.75″ and can be used on both straight and angled parts of swing sets. It is suitable for use on 4x4s and 4x6s and can be stacked up to two high. The leveling block comes with a pre-drilled hole for a rebar stake, which is sold separately.