A molle lock is a precision molded attachment specific to "mollle" type applications. You simply attach it to your sheath first (with the included hardware), then open it, slide it through your molle webbing, snap the spring assisted lock back into place and you are good to go. 
 
You can run the molle lock on either side of the sheath to give you the option of running the blade for right or left hand deployment. 
​
The molle lock is what you want to securely carry your blade vertically on plate carriers, battle belts and other kit that has molle webbing.