Description: Versatile Installation Options: The 220mm wide dovetail plate can be mounted on the top of telescope rings as a guide rail or at the bottom to connect with a wide track equatorial mount, offering flexibility for various astronomical setupsAluminum Alloy Construction: Crafted from aluminum alloy, this dovetail plate ensures durability and stability, providing reliable support for your telescope equipment during observationsCompact Dimensions: With dimensions of 22cmx8cm, this wide dovetail plate is designed to fit seamlessly into your existing setup without adding unnecessary, making it an ideal choice for both amateur and professional astronomersEasy Installation: Easy to install with some tools required, making them convenient for all usersComplete Package Includes: Each purchase comes with 1 dovetail plate, ensuring you have everything you need to enhance your telescope's mounting capabilities Specification: Material: Aluminum Alloy Size Chart: 8cmx22cm/3.15inchx8.66inch Package Includes: 1 dovetail plate rail guide Note: Please allow slightly errors 1-2cm differences due to manual measurement.