Carbon Steel Protobox 5lb. (Assorted Alloys) -Part #: 21889

See Cold Roll Steel Tolerances

It's a metal variety box filled with a mixture of different shapes, sizes, and weights in the metal of your choice. Designed with prototyping, testing, and tinkering in mind, most pieces in the Protobox are smaller than 12" x 6". Each Protobox is different, based on the materials available at the time your box is packed.