These corner protectors are made from high-quality metal and are designed to last. They are perfect for protecting your books from damage.Each book corner protector measures L30mm with a 5mm channel and features a sleek design that complements any book cover. They are easy to apply using a hammer with and cloth to protect the metal if you don't have an applicator and are suitable for all types of book covers that fit the channel dimensions (no thicker than 5mm). If you're looking to add some extra protection and a quality look to your books or binders, these corner protectors are the perfect choice. Comes from a smoke and pet-free home.