How to crack open Walnut Shell?

This is how a walnut with shell look like. The size is about 4-5cm long. Some of the shell is quite hard to crack.

Some bought for their Hamster to grind their teeth.

Where you can get Walnut with shell from? You can easily get from 3rd floor at Albert Centre, Bugis. There is many shops selling dried items, nuts, and snacks. I got it from one of the shop there. It sold at $4 for 300g. Of course, the more you buy the cheaper but i don't really want that many.

                                                   

What you need is just a crab clamp to crack it.

This is what i yield from 300g of shelled walnut.

Here is the video of how to crack the walnut.