Heavy and impossible to hang!  We had 3 people, 2 ladders and still could not get it to catch properly.  The screws are the exact size as the holes in the back.  As we kept holding the shelf up to catch the screws to hang it, the screws would miss or get pushed into the wall.  When we finally caught one screw it began to bend out of the wall.  We did not feel safe letting such a heavy piece hang on the four screws provided with small children running around.  We are returning this product.