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A concrete mixer is a device used to mix concrete components – cement, water, sand and aggregate – in order to obtain a uniform concrete mass. It is an essential tool in construction, used both in small housework and in larger construction projects. Concrete mixers are available in different sizes: from small portable models with a capacity of several litres, to large industrial mixers that can accommodate several cubic meters. They can have electric, diesel or manual drives. Concrete mixers consist of a rotating drum mounted on the basis, a drive mechanism and handles or wheels for easier transport.