LED Base Socket Adapter Bulb Base Type Medium Screw (E26) Compatible with Grainger Part Number 429U43 429U44 472Z16 472Z17 472Z18 472Z19 Compatible with Manufacturer Model Number LED21ED17/740 LED21ED17/750 LED35ED17/730 LED35ED17/740 LED35ED17/750 LED45ED17/740 LED45ED17/750 LED45ED17/835 LED50ED23.5M/730 LED50ED23.5M/740 LED80ED23.5M/740 LED80ED23.5M/750 Features For use with E26 Based Lamps for Mogul Base Applications Product Type Socket Adapter Standards NEMA