<https://www.ggrgroup.com/products/stone-lifters/upright-stone-clamp/#webpage>
<http://schema.org/description>
"With a lifting capacity of up to 800kg, this is an excellent tool for upright positioning of stones, monuments and stele with a maximum 60mm thickness."
<https://www.ggrgroup.com/products/stone-lifters/upright-stone-clamp/>