Feature●#555 LIGHT BULBS - Compatible with #555 Bulbs●#194 LEDs - Compatible with #194 LEDs●#147 BULBS - Compatible with #147 Lamps●GREAT REPLACEMENT PARTS - Replace Old Worn Bulbs with New Bright Ones●GREAT FOR ARCADE REPAIRS - Part is Great for Repairing Arcade Games to Working OrderDescription Set of 3 Pinball Lamp Light Bulb Socket Twist Lock: T 3-1/4 Wedge Socket. Compatible with #555 bulbs, #147 lamps and #194 LEDs. Used on printed circuit boards that have holes cut for it - it will not work by itself.