1This guide scope is made of quality material, sturdy, lightweight and durable 250mm guide scope with bright, which offers 1mm precise adjustment, helps you quickly finder the target in the telescope 3Comes with a bracket that fits all kinds of telescope, easy to install 410mm focusing range in both sides, helical focuser is easy to use 5Nice accessory for astronomy lovers, suitable for Celestron, Vixen, etc Features: This guide scope is made of quality material, sturdy, lightweight and durable.50mm guide scope with bright, which offers 1mm precise adjustment, helps you quickly finder the target in the telescope.Comes with a bracket that fits all kinds of telescope, easy to install.10mm focusing range in both sides, helical focuser is easy to use.Nice accessory for astronomy lovers, suitable for Celestron, Vixen, etc.Specification: Material: Aluminium Alloy Color: Black Object Dia: 50mm / 1.97in Focal Length: 190mm / 7.48in Double Helix Focusing Range: 10mm (10mm in front and back sides, 20mm in total) Weight: Approx. 766g Package List: 1 x Finderscope 1 x Bracket