tie down blocks
These blocks have tie down points (utility anchors) cast directly into the concrete at the time of pouring. This allows you to secure chains, straps or ropes to the points and be assured that whatever you're securing won't move. These are often used to secure marquees, demountable buildings and shipping containers.
Available in 0.5, 1.0 and 1.5T
Available in flat top or interlocking