75-degree dovetail groove Starry dovetail plate. Astronomical telescope accessories・75-degree dovetail groove・metal structure・multiple formation methods Usage scenario: For the fer of astronomical telescope main mirror and tripod (cannot be moved forward and backward), can be used for astronomical main mirror with dovetail plate without screw holes at the bottom to fer to tripod. For the fer of astronomical telescope main mirror (movable) and tripod, can be used for astronomical main mirror with 1/4 screw hole at the bottom, connected to the square dovetail slot, ferred to the long board or short board and connected to the tripod. Used for the fer of the primary mirror of the astronomical telescope and the equatorial mount/guide star accessories (removable) 1. Suitable for astronomical primary mirrors with a clamp and no dovetail plate (long or short plates can be added to achieve connection with other equatorial mounts) 2. The guide star mirror can be ferred on the upper part of the clamp (using a long or short plate + a square 75-degree slot) (removable) Used for the fer of the primary mirror of the astronomical telescope and the equatorial mount/guide star accessories, suitable for astronomical primary mirrors with a clamp and a dovetail plate, the guide star mirror can be ferred on the upper part of the clamp (using a long or short plate + a square 75-degree slot) and the finder mirror can be added as needed for simultaneous fixation, Zhenwang box and other guide star equipment. Color: Red Material: Aluminum Alloy Package Contents: 1 x 75 degree dovetail groove Only the above package content, other products are not included. Note: Light reflection 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.