Circular Concrete Spacers Machine: The structure to use: Almost concrete spacers can be use for all various kind of structures. However, some type of spacer are specially designed with specific structures only two workers, you can do all the work, from feeding, mixing, production to placing the blocks on the site. Advanced machine replaces the manual labor of workers to reduce the capital for employment. production rate of the Concrete spacer machine is particularly high, especially for the production of small spacers.