The Hi-Tech Volumetric Concrete Mixers are designed to produce exact quanitites of concrete, reducing waste and the overall carbon footprint of concrete production. Ideal for street patching and repair where small amounts of concrete are required using different mix designs, the mixer produces capacities between 2 to 10 cu. yds. Production rates range from 15 to 200 cu. yds./hr. Elkin Mobile Concrete Mixers. 800-245-6899.