Hi Chris,
Thank you for your question. These will have a little flex, however we don't believe it will fit a 3/4"bullnose corner. If you would like to receive a sample, please e-mail your information to, samples@kofflersales.com. Also, please look at this product, it comes in a bullnose corner, http://kofflersales.com/p/corner-guards-textured.asp?cid=56
Thank you,
The Koffler Team