An IWB clip, or "Inside the Waist Band" clip is a metal clip meant primarily for concealed carry applications in which you carry the knife vertically, concealed on the inside of the waist band. Simply mount to the sheath (hardware included), and drop it where you want it. 
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You can run the clip on either side of the sheath for right hand and left hand deployment. 
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The IWB clip also works well for hiding your knife in the kangaroo pouch of your plate carrier, chest rig, or similar set up.