Abstract: A device for releasably fastening up to four adjacent slab corners to a support wall or ceiling. The device is positioned at a common point of adjacency of a number of slabs. A locking disk having a quadrant notch is rotatively mounted orthogonally to the surface of the slabs, and engages or disengages slots cap in the thickness of the slabs according to the angular orientation of the disk. The device is capped by a decorative rosette having an appendage projecting loop bracket shaped and dimensioned to accommodate a bud vase. The device is particularly indicated for fastening slabs used to cover adjacent funerary crypts.