Available in A4 or A5, the Unibind SteelBack is a steel u-channel spine, which comes in various colours, for use with a Unibind thermal binding machine. Its tear off paper guide sheets allow you to add your own front and back covers or Unibind Transparent CoverSets, HardBook CoverSets or Card CoverSets. The SteelBack gives you the flexibility to produce A3 and A4 landscape documents as well as A4 and A5 portrait. Once bound on a Unibind machine the unique patented polymer guarantees a secure, long-lasting bind that allows your document to be easily edited. Available in various sizes, this spine-only product allows you to bind up to 340 pages in A4 and 100 pages in A5.