Aven's LED Focus Mount with LED Ring Light. 74mm diameter with coarse focus. Will accept SSZ, SPZ, DSZ, and NSW series microscopes.Has a 5/8" Adapter for mounting onto the boom and articulating stands. Includes a built-in eco-friendly daylight 60 LED ring light with dimmer control. LED lights have a long life and low power consumption. Designed to fit Aven's Binocular and Trinocular stereo zoom microscopes. The 60 ultra-bright, energy-efficient LEDs provide a minimum of 20,000 hours of high-output life. It comes complete with a dimmer control.