Check the listing for details. Astro Tech AT60ED Bahtinov Focus Mask -RED-AT60ED. Condition: New. Listed at 10.79 USD. If need inner diameter or specifications of mask just message me I can check to see if it fits or give measurements from software. Or I can change size to fit another model. Everything is customizable in my store. Its all 3D Printed and made from software. Bahtinov Focus Mask for Telescope - Astro Tech 60ED SLIDE ON. Condition is New. Shipped with USPS First Class. Software Designed and tested. Works great with these and similar models. 3d printed and designed by Spencer 3d. As always fast USPS SHIPPING. 2 TO 3 DAY SHIPPING. Red ,Other colors available. If need a different size to fit your telescope message me as i may have a design or i can design one to fit your needs. Also available in white or black or other colors, comes in blue. Message for color . AT60ED