1.Dovetail base -- Fit most bracket from , , -watcher, , etc. Compliable with finder scope, Pointer bracket on telescopes. 2.Great for adding a second or third device to your telescope. 3.Dovetail base fits finder scope or reflex sight bracket so you can securely attach an device to any telescope. 4.Suit for different telescope tube except - telescope optical tubes, includes two attachment screws. 5.Made of high strength Aluminum with Aluminium Process. 6.Suit for all - watcher telescope, telescopes, C8, C8HD, C925, C11HD, 80ED, 100ED, 102ED, 130ED and some , -watcher, and telescopes. 7.Designed to accept finder scope (with bracket) or EZ Finder . perfect for custom installation of a finder scope on telescopes not already equipped with a compatible base. Bases feature a thumbscrew lock to secure the finder scope bracket in place . Note: there are no attachment screws to hold it to your optical tube assembly. 8.Use M6, M8, or 1/4inch threads screws to it to the optical tube. 9.Easy to use, just put it on the optical tube and tighten the screws. Model: Dovetail Groove Use: Astronomy Telescope Suit for: Finderscope/Equatorial Mount/Altazimuth Mount/Pan-Tilt Weight: 430g Max Loading Capacity: 20kg M8 pitch: 35mm M6 1/4 pitch: 38mm/60mm 3/8 pitch on the left Feature: Screw with Brass for no scratches Colour:silver Material:aluminum alloy Package Contents: 1 x Dovetail Saddle Mount Platform 2 x Mounting screws 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.