Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice construction, but don't work

The mounts are very nice construction and the kits are good, but frankly they don't work that well. I have 14# speakers on each mount and no matter how hard I have tried to tighten the bolts, the speakers sag until they touch the wall for a wall mount. I have had someone else hold it up while tightening with both hands and a wrench until I can turn the bolt no farther. 30 minutes later it has slowly slid to the wall. For a lighter speaker it may work, but the mounts shouldn't be rated to 20#.