What type of knife does Glenn use to kill the zombie in the walking dead ep6?

Glenn kill the walker in the store with a knife that has a hook on it and he uses the hook like an ax to chop. It's the most recent episode. Thanks!What type of knife does Glenn use to kill the zombie in the walking dead ep6?
Gator Machete Pro, by Gerber:

http://www.gerbergear.com/Apocalypse/Gear/Gator-Machete-Pro_31-000705



It's one piece out of a set called the Apocalypse Survival Kit:

http://www.gerbergear.com/ApocalypseWhat type of knife does Glenn use to kill the zombie in the walking dead ep6?
Its a type of Russian/Spetsnaz Survival Machete. Don't know why there's a hook on the end of it though, maybe it was modified by its original owner.

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