AmScope FR-A1 Stereo Microscope Focus Block with 76mm Collar 32mm Tube Mount Lamp Slot

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This is a focus rack for major brand stereo microscopes like Olympus, Nikon, Zeiss, Leica, etc. It comes with ball bearing and 3" (76mm) diameter of annular ring that holds microsc ope head. Features & Specifications: Brand new focus rack with ball bearing Focus gear with coarse focus and tension adjustment Diameter of annular ring holding microscope head: 3" (76mm) Diameter of opening for stand post (arbor): 1-1/4" (32mm) Distance between central line of annular hole and that of microscope body: 5-1/2" (140mm) Focusing distance in vertical direction: 2" (50mm) Shipping Weight: 4 lbs Manufactured under ISO 9001 Quality Control Standard Show more