Easyget 10 X Blue Classic Concave Arcade Push Button with Microswitch & Fixing Ring (28mm*33mm Happ Style Arcade Push Button) for Arcade Machine Projects , Mame Cabinet Projects , Video Games Projects and Jamma Machine Projects 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.