This item is a simple and practical self-locking , mainly made of and sturdy aluminum alloy material, not easy to rust and deform, and can be for a long time. With a simple design, efficient and practical, Great for horn button . This is a very good modification self-locking , which will serve you well. Features -Color: White. -Material: Aluminum alloy, rubber. -Size: About 3.70X2.20X2.20cm/1.45X0.86X0.86in. - Stable installation, not easy to fall off. Though it is simple in design, it's so practical when you use it. - The excellent workmanship of our product will bring you a . - Made of material with stable performance and . - Widely Application: suitable for mechanical equipment, automobiles, ships, household equipment, toys, etc. - Also applicable to CNC lathes, instrument , electrical box . Specification: Light Color: White. Light source type: LED Lamp voltage: 12V/24V. Installation size: 16mm. Contacts rated working : 3A Working environment temperature: -20~+55 Working voltage: 250 (V) Working : 3 (A) Contacts resistance: <=50m () Insulation resistance: >=1000M (M) Head protection level: IP67 Operating temperature: -20~+55 ( degree centigrade) Package list: 1 x 1 x rubber ring