Meco series 1000 medium duty cantilever rack units are a complete storage system designed with flexibility and simplicity in mind. Meco Omaha has assembled the most popular standard heavy duty and medium duty cantilever components to create start and add-on units. Taking the guesswork out of selecting a rack system. Order a single or a double sided starter unit. Each unit consisting of 2 uprights, straight arms and braces to assemble a single bay storage unit. Create a continuous rack system by adding add-on units, which include: one Series 1000 upright, straight arms, and the appropriate brace set.