High-quality prism ensures high light transmission and provides high defination images. The fully coated lens are supplied with a dust cover to keep your lens clean and clear. With wide 90 degree angle, it is convenient for viewing refractor image from telescope stand. Use the 90 degree diagonal mirror with a refracting telescope, the image is upright, with the left and right reversed. Compatible with 0.965 inch telescope eyepieces. Colour: black Material: plastic Package Contents: 1 * Telescope Diagonal Adapter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.