other sellers pls do not steal our product and description for resell !!!!!

thank you for your cooperation.

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Feature: 
This base is all metal, very heavy, make sure you can get a steady base when operation. 
We provide the boom stand only. This is not a complete system. A microscope head with optics is needed. You provide the head. We have several types of adapters to fit a variety of microscope heads. Contact us for details about your specific requirements so we can assist with a smooth fit. 

Easy Large-Sized Focusing Knobs on Both Sides of Focusing Holder. 

Steel Gears on Focusing Holder. 
1: Standard Size Focusing Holder - Will Fit Scope Heads with Diameter of 50mm :

2. Hand Wheel Focusing Range: 75mm
3. Bracket & Bracket Interface Size: 50mm; 25mm
4. Fine-tuned Adjustment Accuracy: 0.002m  

Package including 
1 x Microscope Table Stand with holder support