1All-surface multilayer coated prism system. 2Used for 1.25 inch focus seat and 1.25inch eyepiece. 3Interface with 1.25 inch thread can be connected with 1.25in filter. 4Constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan. 5Not recommended for use in reflective telescopes. Features: All-surface multilayer coated. Used for 1.25 inch focus seat and 1.25inch eyepiece.Interface with 1.25 inch thread can be connected with 1.25in filter.Constructed with aluminum alloy housing and stainless steel cover plate, available for long lifespan.Not recommended for use in reflective telescopes.Specification: Condition: 100% Brand new Material: Aluminum alloy+Stainless steel Color: As shows in pictures Size: 6.5*3.5*3cm / 2.56*1.38*1.18in Gross Weight: 136g / 4.8oz Package List: 1 x Dielectric MirrorNotice: Please allow slight error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures.