[Telescope Accessory]: Enhance your stargazing experience with this essential telescope accessory, designed to provide optimal balance and stability for your equipment [Construction]: Crafted from stainless steel, this balance kit ensures long-lasting durability and resistance to wear and tear, making it a reliable addition to your telescope setup [For Narrow Rails]: Specifically designed for narrow rail systems, this component fits rails approximately 43.5 mm in width, ensuring a secure fit for your telescope [Versatile Weight Options]: Available in multiple weight options (0.25 kg, 0.5 kg, 1 kg), allowing you to choose the ideal balance configuration for your specific telescope needs [Easy Installation]: Features a telescope dovetail mounting plate; easy to install and replace within seconds, no complicated tools required. This dovetail plate is compatible with astronomical telescopes and can be connected to other equipment for professional and practical use Specification: Material: Stainless steel Size: 4.35 cm (1.71 inches) Package Includes: 1 x Telescope Narrow Rail Primary Mirror Balance Kit Note: Please allow for slight measurement variations of 1–2 cm (0.39–0.79 inches) due to manual measurement.