Check the listing for details. Telescope cap 100mm O.D fit with 80mm centered hole. Condition: New. Listed at 10.79 USD. This Spencer-3D telescope cap is the perfect addition to your telescope. With a 100mm O.D fit and 80mm centered hole, it is compatible with a variety of brands and series. Made of durable plastic and weighing only 5 oz, this mask is both practical and convenient. It is manufactured in the United States and is compatible with the Spencer-3D series. Whether you're a seasoned astronomer or a beginner, this telescope cap is a great way to protect your telescope and add a touch of personalization. Its lightweight design makes it easy to carry around and use, while its compatibility with multiple brands ensures that it will fit most telescopes. Get your hands on this high-quality Spencer-3D telescope cap today! 3D Printed and designed by Spencer-3D. Originally made custom part for customer.