We leveled 1300 square meters ourselves. Feet with deviations from 1/8 to 1 inch. It was the first time we did that (God forbid the last time). These pens REALLY helped. Once the concrete is mixed and poured, there's no stopping. The pegs were a much-needed guide to determining where to push more concrete into an area and when to remove it. You cut the pins to the right height, clean and glue them to clean concrete. Out of 50 we had only 2 peels and then from repeated strokes with a pressure mop (drum rake easily rolls over it)
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