What Toor Knives says:
The Inside Waistband Belt Clip offers an adjustable cant as well as a 1.75” loop for belts and was designed to be worn on the inside of your waistband, for ultimate concealment.  A reverse hook ensures an anchored draw, while the beveled plastic edges provide a comfortable fit, whether sitting or standing.

Necessary mounting hardware included.

Instructions:

1. Line up the appropriate mounting holes.
2. Slide the two female posts through the back of the sheath holes and slide the rubber bushings in-between the posts and the clip.
3. Place the clip back over the bushings and screw it in.

Quinn Knives' take:
Toor Knives calls this the Inside Waistband Belt Clip but we've been doing some experimenting and found it works with or without a belt, inside or outside of the waistband. If you are needing a mount that you can just clip on and go, this one should do the trick.