Alpinetech 19mm 3/4" Momentary Normally Open Metal Push Button Switch Screw Terminal Extended Button (Black) Momentary Normally Open (Push & Hold for ON, release OFF) Easy installation with screw terminals Head Size: 22mm, Mounting Hole Size: 19mm (3/4") Great for electronmagnetic Starter, relay, Horn Button Switch, Guitar Kill Switch, PC Power Switch or any DIY MOD projects.