Product details:

Aluminum is light, strong and distinctive, making it and ideal material for a portfolio book. The Machina Screwpost Covers are crafted of satin finish aluminum with a clear protective coating and are constructed to last a lifetime. Available in ten formats, these books are compatible with all major brands of sheet protectors, mounting sheets and adhesive hinge strips. Nylon jackets (sold separately) are available for all formats to protect your portfolio from light, dust and scratches. Expand the portfolio's capacity with standard screwpost extensions (sold separately). Lies flat when open.