In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.

I purchased this product with hopes it would be useful in repairing antique picture frames. I found it absolutely useless. The plastic corner blocks bend when tightened down and slip off when tightening the screw rods. This might be useful if you're making a 5" x 5" frame, but I doubt it. Don't waste your money!
Save your money. Go to Home Depot and purchase the $9 corner clamps.