Screwdriver (2)

In order to answer a number of question from Andy's comment on my last post, I decided to add a little bit more information about screwdriver as follows

Yes, the main purpose of my last post can make people know more about just a simple screwdriver, this kind of hand-tool some people even use it everyday. For the function and usage may it be commonly known as pointed out in my post - "to drive the screws". Of course, price can be different with many reasons for the same piece of screwdriver:
1) your purchasing quantity
2) you buy it directly from factory or through an import and export company (vendor)
3) what kind of packaging you need

Furthermore, different materials and finishing treatment impose a major effect on the steel quality. We usually use "hardness degree" - HRC under "Rockwell Hardness Scales" to show the difference on the quality of steel:
- Low Carbon Steel (HRC32-38)
- High Carbon Steel (HRC39-45)
- Chrome-Vanadium Steel (HRC46-52)
- SK2 Steel (HRC53-56+)
The above is only a rough information for reference. Surely, a good (high-quality) screwdriver need to be hard enough to pro-long the life of the "tips" (screwdriver head).