【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 43.5mm in width, ensuring a secure fit for your telescope 【Versatile Weight Options】: Available in multiple weight options (0.25kg, 0.5kg, 1kg), allowing you to choose the ideal balance configuration for your specific telescope needs 【Easy Installation】: Features a dovetail mounting plate for quick and simple installation without the need for complicated tools. This plate is compatible with astronomical telescopes and can connect to other equipment, offering a professional and practical solution Specification: Material: Stainless Steel Size Chart: 4.35cm / 1.71inch Package Includes: 1 x Telescope Narrow Rail Primary Mirror Balance Kit Note: Please allow slight measurement errors of 1-2cm (0.39-0.79 inch) due to manual measurement.