This 220mm Astrophotography Guide Ring Star Finder Base Dovetail Mounting Plate is designed for astronomical telescope enthusiasts seeking reliable mounting solutions. Crafted from durable aluminum alloy, the mounting plate offers a lightweight yet sturdy structure that withstands regular use while maintaining equipment stability. The plate measures approximately 22cm x 4.4cm (8.66inch x 1.73inch), providing ample space for mounting various astronomical accessories. The dovetail design ensures secure attachment to compatible telescope mounts, while the 1/4 inch screw thread offers universal compatibility with most astronomical instruments and camera equipment. Size Chart: 1 Astrophotography Guide Ring Star Mounting Plate Note: Please allow slightly errors 1-2cm differences due to manual measurement.