Momentary SPDT Lever Switch made by Tamiya. Works well as a bumper switch on you robot. Set this switch to turn on when the switch lever is depressed and turn off when the lever is released, or set it up the opposite way. The switch is about 3/4" long, 1/4" thick. It is about 9/16" wide compressed and about 3/4" wide with the lever extended (width includes the posts).