10pcs Metal Momentary Push Button Switch with IP65 Protection: Waterproof and rustproof, can be used in wet or dusty environment. Push Button Hole Diameter: 12mm, Push Button Hole Thread: 0.75mm. Momentary Type: Push & Hold-ON, Release-OFF. Widely Used: Great for horn button, ect. 12mm Push Button Type: Makes it easy to install and disassemble. Quality after-sales service, if anything is not satisfactory to you, please contact us for a full refund or replacement.