All of our corners are top quality products and we have successfully sold them to the picture framing industry for over thirty years. These are simple items and we have described them as clearly as we know how in this website. IT IS UP TO THE BUYER TO DETERMINE SUITABILITY FOR HIS PURPOSE BEFORE PURCHASE - BASICALLY THIS MEANS DETERMINING HOW MANY YOU NEED AND IF THEY WILL FIT YOUR FRAMES. We are always happy to send samples first to help you determine suitability. Therefore, we reserve the right to bill a 20% restocking fee plus delivery & return charges on items returned for reasons other than specific verifiable product defects. Defective Products (very rare) will be promptly replaced or refunded.