I bought these for my security jobs, some companies today will allow a safety/security officers to use handcuffs(once an aggressor has been contained/detained legally)on the job site. But they won't supply them to the officer. These are good strong quality cuffs that don't cost an "arm and a leg". Which is good because most security personal get paid very little.
Police Double Lock Handcuffs
Half the price of S&W handcuffs and from what I can tell not that much of a difference. The person handcuffed by these certainly won't be able to tell the difference.
The double lock is well worth the few extra dollars.