Magnifying lamp features a 4" glass lens that magnifies items by 175 percent to give you a closer look at your items. The long, adjustable arm provides a 37" reach to easily observe large or small items. 9.4-watt bulb delivers a glare-free, natural daylight effect to ensure your items stay bright & vivid. Plus, a convenient wire handle makes adjustments simple for easy maneuverability. Magnifying lamp with a metal clamp is designed to attach to surfaces up to 2-1/2" in thickness.