I studied all the racks and decided this was the one to get the wine off the floor in our small wine cellar. It is perfect. VERY WELL packaged.  I put it together by myself sitting on floor.  I used shoe boxes to separate the two sides while I got the bars connected (screws and nuts) to each side.   Came with extra screws, nuts, dry wall anchors just in case.  Finger tightened at first, then once assembled, tightened the screws with Phillips head screw driver while holding the nut firm with provided wrench. Very happy with purchase.  Would buy again if needed.  Minimal, but very sturdy.  The drill size for the drywall anchors is 1/4".  I hope these hints help you.