Abstract: A railing mounting device for mounting railings to concrete slab walls includes a stanchion and an anchor insert. The stanchion is releasably mountable to the anchor insert. The stanchion is elongate and extends longitudinally between opposite first and second ends. The second end has a mounting member rigidly extending therefrom for sliding snug releasably securable mating engagement in a corresponding cavity in the anchor insert. The anchor insert is rigidly mountable into a concrete wall panel by flanges, fins or the like. The mounting member lies generally within a first plane containing the first and second ends. The first end is laterally offset in the first plane relative to the second end so as to extend over the mounting member in the first plane. Rail mounts are mountable to the stanchion towards the first end so as to mount rails to the stanchion offset relative to the second end.