ABS Plastic Project Boxes & Protoboards Twin Industries ABS Plastic Project Boxes and Protoboards are sold as a single part number, thus eliminating the need to find a compatible board and box. The Twin Industries' Protoboards are available plated or non-plated and feature mounting holes to attach to the box lid. Constructed of 0.062' thick FR4 laminate, the prototyping holes are spaced on a 0.1' x 0.1' grid and offer an uncommitted board area for mounting board edge connectors or components. Screws to close the box are included.