Welcome to our store！</br>1、Application: This adjustable focal length mount is suitable for objective lens sizes of 50mm, attachment pillar sizes of 22mm, and center distance of 135mm. 2、Stable Structure: Made of high strength alloy material, black appearance, the bracket has stable structure, ensure stable and clear image effect. 3、High Performance: Easy to attach, convenient to use, the adjustable focus stand can be precisely adjusted to ensure bright and clear image. 4、Application: Perfect microscope accessories, exquisite workmanship, can be widely used in microscope, with good durability and stability. 5、Fine Workmanship: Professional manufactured, exquisite workmanship with unique design, ensure stable performance and high reliability. <p class="wang-edit-text"><p class="wang-edit-text">Item Type:&nbsp;Adjustable&nbsp;Focus&nbsp;Stand Material: Metal alloy Applicable Objectives Lens: Approx. 50mm/1.97in Applicable Connection Pillar: Approx. 22mm/0.87in Center Distance: Approx. 135mm/5.31in <style> .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }</style> 1 x Adjustable&nbsp;Focus&nbsp;Stand Satisfaction - Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We try our best to provide you with satisfactoryaftersalesservice</br>