Fits 1″ diameter handlebars. Includes 3 momentary truly miniature push-button switches and 2 meter wiring. Installs with two M5 screws that are flush mounted. When installing two of these switches opposite to each other you will have 6 switches of which the housings together are still not larger than a regular a regular switch housing. Dimensions: 45mm OD x 14mm wide. Note: Designed for use with relays.