GE Lamps Quartzline Incandescent lamp provides three levels of light for maximum flexibility, low for mood lighting and energy savings, high for task lighting. It is designed for 3 way lamps in your home or office, GE 3 way bulbs offer a range of light levels. PS25 shape bulb with mogul base for use in table lamps and enclosed fixtures. It measures 3.125 inch diameter x 6.680 inch. MetalHandy Box4"H X 2"W X 2-1/8"D16.5 Cubic Inches3/4" KnockoutsWeldedGE soft white 3-way bulbs provide three levels of light for maximum flexibility, low for mood lighting and energy savings, high for task lighting. Use GE soft white 3-way bulbs warm, pleasing light without harsh shadows in table lamps and floor lamps