1 and SK9 are a kind of tool steel, also known as carbon tool steel. This kind of steel is widely used and can be used to manufacture various tools and equipment. Sk9 scissors are made of sk-9 stainless steel, which has the advantages of sharp cutting, easy labor saving, rust prevention and durability.

2. In the jewelry industry, sk9 refers to a silver alloy, namely 925 pure silver. This silver alloy is composed of 92.5% pure silver and 7.5% other metal alloys, and is widely used to make various silver ornaments.