Features: 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. Specification: Item Type: Adjustable Focus Stand_x000D_ Material: Metal alloy_x000D_ Applicable Objectives Lens: Approx. 50mm/1.97in_x000D_ Applicable Connection Pillar: Approx. 22mm/0.87in_x000D_ Center Distance: Approx. 135mm/5.31in PackageList: 1 x_x000D_ _x000D_ AdjustableFocusStand