Super small Momentary Pushbutton Switch for Handlebars or Flat Surface. Comes with radius washer for clean mounting on handlebars. Works great for a horn or kill switch. Use with a relay and this can be a super clean starter switch. Threads are 5/16-24 UNF (fine thread). When drilling and tapping something that you would like to mount this switch to, you must drill a 9/32 inch (.281) diameter hole before tapping.