The Ultimate Blue-Collar Challenge: Can You Identify These 20 Hardcore Concrete Tools?
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What flat sheet panels do concrete finishers kneel on to support their weight when working across semi-wet slabs?
Explanation
Knee boards (or concrete sliders) are smooth aluminum or plastic sheets that slip over wet mud. They act like snowshoes, distributing the finisher's knee weight safely across the slab to prevent deep footprints.