The document discusses self-locking fasteners that provide benefits over traditional fastening methods. The fasteners are secured through coordinated drilling geometry and threading, and come with sealing washers to provide watertight sealing that compensates for different sheet thicknesses. They are made of corrosion-resistant 316 stainless steel. They provide benefits of security against stripping, firm clamping with low potential for error during setting. Installation requires only one tool and operation for efficient work.