Save your money. Go to Home Depot and purchase the $9 corner clamps.

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!

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