Butterfly screws, also known as toggle bolts, are a type of fastener that features a pair of wings that fold during installation and expand once they are inside a pre-drilled hole. The design allows for a stronger grip on hollow walls, such as drywall, where regular screws might not provide sufficient anchoring. Butterfly screws are particularly useful for mounting heavier items like televisions, where the risk of falling can be a significant concern.

Cross bracing is designed to counteract lateral forces—such as wind loads and seismic activity—that can compromise a building’s stability. By installing steel studs diagonally across a frame, the structure can effectively distribute stress and enhance resistance to buckling. The mechanism works on the principle of triangulation, where the cross-braced elements work together to form a rigid framework that maintains its shape under stress.