20/25/35mm secondary mirror holder set for 76mm, 114mm, 150mm Newtonian reflecting astronomical telescopes

20mm Short - Axis Secondary Mirror and Holder Set, including the secondary mirror + secondary mirror holder, suitable for installing on a Newtonian reflecting telescope with a 76mm aperture. The short axis of the secondary mirror is approximately 19mm, and the long axis is approximately 27mm. The bottom of the mirror holder has a threaded hole with an inner diameter of approximately 4.3mm.

25mm short-axis secondary mirror holder set, including the secondary mirror + secondary mirror holder, suitable for installing on a 114 Newtonian reflecting telescope. The short axis of the secondary mirror is approximately 24mm, and the long axis is approximately 34mm. The bottom of the mirror holder has a threaded hole with an inner diameter of approximately 4mm.

35mm short-axis secondary mirror holder set, including the secondary mirror + secondary mirror holder, suitable for installing on a 150 Newtonian reflecting telescope. The short axis of the secondary mirror is approximately 35mm, and the long axis is approximately 50mm. The bottom of the mirror holder has a threaded hole.