It is precisely made set of 7 Pencils required for Testing Diamond strength (Hardness of a Gemstone in comparison of Diamond).
Pencils are made of Chrome plated Brass metal and duly mounted with an equivalent hardness point.
The set includes pencils rated 10, 9, 8, 7, 6, 5 & 4 on the Mho's hardness scale. Pencils are packed in a genuine leather pouch.
Pencil's size is 10 CMS long and 6 MM in diameter.
|
 |
