Eversen specialized Bolt Retainers are excellent for use on critical blind fasteners where no lock nut or retaining compound can be used. They also work great for fasteners on rotating assemblies. Cut out of 16ga 304 stainless steel, these are malleable enough to form into shape for your application without complex tools. Sold individually. Hardware not included. Please confirm width across the "flats" of your bolt head per the drawings.