Swivel Knife Blades 

Thanks Johan, I did learn something from this video.

Thank you Johan. Very interesting. I'm about to buy a good quality knife and this has helped a great deal.

Thanks for the info/demo

It helped a lot...... Thanx :)

I can tell you exactly what that is for a material. It is sapphire! It is a very common material for use as cutting edges, helicopter windows, etc. It is used for all kinds of things.

Wow, I’ve never seen the clear ones- are they glass? You always have such interesting content. Thank you!

How do you change them thoughBecause I have the 70s Model