Features:

With Dual Ring:50mm(diameter) ,22mm(diameter)
Large table stand for stereo microscopes
29cm microscope high pillar
Size: 22cm x 15.5cm x 33cm(height)
Material: Alloy Aluminum

there is a 50mm to 40mm Ring so you can use it both with 180X lens and 100X lens

Package Including:

1 x Digital Microscope Table Stand
1 x 50mm to 40mm Ring