Belt loop fitting used on a sheath.

Leather sheath with belt loop fitting (hinge/loop):
This allows you to attach the knife directly to a belt or gear.

Advantages:
Safer carrying: The knife is securely fixed, reducing the risk of it falling out.
Easier access: Faster to draw the knife during work or outdoor use.
More stable position: The sheath stays at the same angle and moves less.
Practical for field use: Ideal for hunting, hiking, and work where the knife is used frequently.