M-2x2 Structural Panel - Kerbal Space Program Wiki
structuralPanel2x2. The M-2x2 Structural Panel, is a structural element that can be used for construction. The panel consists of four M-1x1 Structural Panels horizontally attached. The M-2x2 Structural Panel has a high impact tolerance, and has a relatively low mass which makes it a handy part for almost every vessel.