Stalwart Swing Arm Incandescent Magnifying Lamp Features Include: Powerful optically ground 3-diopter magnifying glass Versatile flexible arm extends up to 36-Inch Fully Adjustable to almost any position with steel springs and tension control knobsMulti-use clamp mounts on table or other flat surfaces up to 2.25-Inch thick Gives excellent lighting and allows hands free use60 watt maximum rated bulb (not included) 3.75-Inch diameter lens