【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 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】: Telescope dovetail mounting plate, easy to replace and install within seconds, no complicated tools needed. This dovetail plate can be used with astronomical telescopes and connected to other equipment, offering professional and practical functionality Specification: Material: Stainless Steel Size: 4.35cm / 1.71inch Package Includes: 1 x Telescope Narrow Rail Primary Mirror Balance Kit Note: Please allow slight differences of 1-2cm / 0.39-0.79inch due to manual measurement