These special blocks provide a lap joint arrangement for outside corners, or can be used to create attractive pillars. A tumbled version is also available for the Parkwall® Classic wall system.
https://brownsconcrete.com/products/garden-retaining-walls/18-hardscape-products/garden-retaining-walls/parkwall/40-parkwall-corner#sigProId2bb2656bc0
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Unit Dimensions: 5.9" x 7.59" x 11.61" (150mm x 193mm x 295mm)
Unit Weight: 42 lbs (19 kg) each