This is a hook knife which looks like a normal key-chain. You can hold out a pull tab to expose sharp hook blade, helps you quickly escape from emergency. Blade locks securely into rigid keychain sheath for added protection. Light and small, could be hang on the key-chain or bag. 

Features: 
Stainless steel construction for durability.
Locks into sheath for added protection.
Circular, aluminum handle with thumb grip.
Can be used to quickly cut yourself out of a piece of clothing, seatbelt or other safety strap, should you ever get stuck in a tight spot. 
Can also used to cut fishing line, trim a tarp or open a package of freeze-dried food.
Light weight and small, it can hang on your key-chain or bag.
Perfect for mountaineer, outdoor enthusiasts and car drivers.

Specifications:
Main material: 440 stainless steel
Item weight: 16g / 0.56oz
Package weight: 20g / 0.71oz
Item size: 4.3 * 2.4 * 0.3cm / 1.69 * 0.95 * 0.12in
Package size: 5.5 * 3 * 1cm / 2.17 * 1.18 * 0.39in

Package list: 
1 * Hook knife