This is a Midwest Industries known as the Tool, model MI-CZSW.
The CZ Scorpion pistol barrel nut socket is useful for the removal of the barrel nut with ease. This also allows you to remove the barrel nut without removing the flash hider retaining clip.
Features:
Hex end accepts a 1.0 wrench or socket
1.50 in length to allow good wrench socket engagement
Steel construction with a black oxide finish
100% Made in the U.S.A.