Specifications: Condition: Brand New Item Type: Microscope Adjustment Bracket Material: Metal Ring Fixed Microscope Lens Diameter: Approx. 50mm/2in Column Opening Diameter: Approx. 25mm/1in Primary Fine Focus: 0.002mm 360 Degree Rotation Thickness: Approx.37.7mm/1.5in Microscope Setting: Suitable for zoom real microscope