This is a 48-LED bright white ring light kit with adapter for stereo microscopes. The kit includes a LED light ring a 110-230V power adapter and a ring mounting adapter. The inner diameter of the light ring is 2-3/8 (60mm). The mounting thread of the ring adapter is 1-7/8 (48mm in diameter). The LED ring light provides cool even intense and focused shadow-free illumination. It is an ideal durable cool light source for microscopes. Features & Specifications: 48-LED Bright White Illumination Cool Even Intense and Focused Shadow-Free Lighting 60 mm Inside Diameter Fitting 35-59mm Mount Rings Coming with an 1-7/8 (48mm in diameter) Mounting Adapter More Than 100 000 Hours of Life Optimum Light Range: 2-3/8 to 5-1/2 (60 to 140mm). Power Input: 110-230V 50-60HZ Auto-Switching. Great for Most Stereo Microscopes