These are Model 5 universal sheath/holster clips. They are excellent for mounting on KYDEX and leather carry systems and are very durable. This model is Black coated (Tactical style) and is common on military sheaths/holsters.

Specifications:
Universal Sheath/Holster Clip
Black (Tactical) Finish
Fits Belt Size: 1.50"
Hole Diameter: 0.215"or 5.5mm
Hole Spacing: 0.500"
(3.75 x 0.75 x .06)