This is a Single Magazine/ Knife Pouch from Galati Gear.

Specifications and Features:
Holds one single magazine for the 45 Auto, Browning Hi-Power, S&W 59 and other similar size pistol magazines as well as a pocket knife
Will accommodate double stacked magazines
Attaches to belt through belt loop guide
Can be worn either vertically or horizontally
Height is 5.5"
Constructed from PVC Tactical Nylon