The handle is one of the hardware accessories used in our lives. There are many kinds of handles, the most common ones are stainless steel handles, zinc alloy handles, aluminum alloy handles, in addition to pure metal handles, pure wood handles, silicone handles, plastic handles, etc. Different materials have different uses. For example, aluminum profiles can be used for at least 30 years without discoloration after oxidation/spraying. Stainless steel materials can be divided into 304 stainless steel and 316 stainless steel. In addition, there are stainless steel iron materials on the market, that is, 201 iron. The material handle is cheap, but because it is made of iron, it is easy to rust after a long time. The best is 316 stainless steel, medical grade stainless steel, better than 304 stainless steel, but the handle material 304 stainless steel is enough.