I normally don't visit this section but that has changed. There is lots of nice stuff here. Yesterday a friend sold me these S&W hand cuffs with Blackhawk pouch. The cuffs and pouch are in excellent condition and will be displayed with some of my M&P's.

Can anyone tell me the function of the small pin at the top of the key is?

Attached Images

Cuffs and more 010.jpg (191.2 KB, 51 views)

It is inserted in the cuffs to "double lock" them so that they don't get tighter on the wrist.

Hey, I appreciate the information.

Yep - double lock - the biggest baddest bad guy with cuffs on behind the back will whine like a little girl when he presses against the cuffs (not double locked) and they tighten on his wrists... your keys should have a small protrusion on the back that fits the lock pin.