1Aluminium Alloy: The switch knob is made of an aluminum alloy that is resistant to wear and drop and does not rust easily, giving the product a long service life. 2Simple Installation: After only one step, you can use the switch snob right away. Put the knob on the interface of your equipment, then you are going to use it freely. 3Not Easy to Slip: The installation of the switch is very tight, and not easy to slip. You do not need to worry about whether it is durable or not. Use it with confidence! 4Flat Surface: The switch knob is flat, with several grooves to indicate the scale, which is easy to observe and will give you a comfortable experience. 5Widely Used: The switch knob can be used in a wide variety of equipment, such as floor lamps, potentiometers, juice machines, blenders, vacuum cleaners, air purifiers, and so on. You can use it anywhere as long as it's the right size. And it is suggested that you always have one for emergencies.