Aluminum alloy material: Guiding Scope Circle is made of aluminum alloy, with a stable structure and strong load bearing capacity, suitable for fixing small astronomical telescopes and other equipmentMultifunctional fixing design: Finding Scope Guiding Scope Circle can fix small astronomical telescope lenses to meet the needs of photography and astronomical observationEasy installation: Finding Scope Guiding Scope Circle has a simple design and is easy to install. It does not require complex tools and can easily fix the equipment, saving timeSimple appearance: Guiding Scope Circle has a simple and elegant appearance, suitable for a variety of scenes, both practical and beautifulWide applicability: Guiding Scope Circle is suitable for photography enthusiasts, astronomy enthusiasts, and other users, and is an ideal tool for outdoor observation Specification: Material: Aluminum Alloy Size Chart: Inner diameter 9cm/3.54inch Package Includes: 1 Guiding Scope Circle Note: Please allow slightly errors due to manual measurement and different monitors.