One for each need
These pieces are used in the frames to keep the minimum distance required between the armour and the formwork, guaranteeing a consistent concrete layer in the finished products. They are also known as spacers or supporters.
They may be of concrete or plastic, both vertical (for pillars, surrounding walls and walls) and horizontal (for frameworks and slabs). They are generally grey to integrate them as much as possible with concrete, although at Valero all our spacers are also available in white to disguise them with concrete of the same colour, which is a recent trend.