These are Model 1 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.
Universal Sheath/Holster Clip
Black (Tactical) Finish
(3/4 x 3-1/4 x .025)
Sold Individually (Qty 1 = 1 Clip)
Note: Image is to illustrate what the front and back of the clip looks like.