Bright polished diamond tread plate aluminum; Includes one sheet (measures 12" x 12"). For indoor or outdoor use, it's totally rust and weather resistant (surface will not rust or flake off). Great for architectural, decorative, automotive and hobby/craft applications. Highly reflective and durable solid metal with slip resistant diamond tread pattern. Made from high quality, durable, corrosion-resistant polished diamond plate aluminum; Easy to fabricate, form, weld or drill; Sheet measures 1' x 1', approximately .063" (1/16") thick.