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?

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