These are ultra-small SPDT slide switches.There is an installation hole at each end of the switchThey can be used for low power electronic projects.They are essential parts for DIYThis The mini slide switch is a great DIY component.Compact and durableSize (L x W x H): Approx. 19 x 6 x 13 mmHole diameter: approx. 2.5 mmColor: blackMaterial: plasticVoltage: 5 VCurrent: 0.3 APackage content:20 SPDT slide switchesOnly the above package content, other products are not included.Note: light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The allowable measurement error is +/- 1-3 cm.