360° solid circular lock. This series of fasteners represents the optimal solution from Howmet Fastening System for addressing loosening and vibration issues, which explains why Magna-Lok stands as the world’s strongest, most reliable, and consistent blind fastening solution. Featuring a unique internal locking ring design,Magna-Lok mechanically locks the nail rod within its sleeve during installation without requiring manual removal. Consequently,Magna-Lok fasteners securely lock the flat head in place permanently.