UNI-BLOCKS are large concrete blocks that each division in United Concrete & Gravel Ltd. produces. They are 2 1/2 feet by 2 1/2 feet by 5 feet long and weigh approximately 4000 pounds. United produces regular plain face blocks and a very decorative natural-rock face blocks. These blocks are used for retaining walls, decorative landscaping, fences and for commercial and industrial applications. Call for pricing and availability.