Features Application -- It is used on the microscope to move the discs or samples continentally. Durable - The movable microscope optical is made of high-quality plastic and metal and has a long service life. High precision - High precision, easy to install and use. Easy to use - It is a microscope accessory, a great replacement for the broken one. Quality service -- Our goal is to serve our customers wholeheartedly. If you have any questions, please feel free to contact us, we will reply within 24 hours! Specifications: Material: plastic, metal. Extended width: 14.5 cm / 0.57 inches. Extended length: 16 cm/0.63 inches. Two fixing pins: 35mm/1.38" Size: 11.5 x 12.5 cm / 0.45 x 0.49 inches. Weight: 178 g. Package includes: 1 x movable microscope optical. Package List