Reyann 6x Black Happ Type Standard Arcade Push Button with Microswitch for Mame / Jamma / Arcade Video Games Mounts into wood or metal control panels Ideal for use within 3/4" wood control panels Microswitch reliability tested to 10,000,000 cycles Vertical attached microswitch with .187" (4.8mm) terminal Classis Concave plunger design,Mounts in 28mm hole.