Aluminum alloy knobs are control devices for mechanical equipment, typically made from metal alloys (such as copper or zinc). Due to their widespread and frequent use in industrial equipment, they are also known as "universal parts." They feature simple and compact structures, small size, and light weight, and are easy to install and maintain, making them widely used for adjustment purposes in various types of machinery.

The categories include: stainless steel knobs and non-ferrous metal knobs. Among the non-metal materials, there are two types: plastic products and rubber products. As for metal materials, there are two types: steel and iron.

They can be further categorized based on different classification standards. For instance, they can be divided into two types: standard-type and special-type, depending on their usage.

It can also be categorized based on its shape: for example, circular knobs can be divided into single-sided circular arc knobs and double-sided arc knobs of polygonal shapes, and various other types, etc.

Additionally, it can be categorized into various models with different specifications for people to choose from and use.