Drilled (but not threaded) to accommodate screws up to 5mm in diameter. Center-to-center screw hole spacing on your telescope must be from 10.2 to 30.2mm in order for this dovetail base to be compatible. Ideal for custom installation of any finder scope, EZ Finder reflex sight, and Green Laser Pointer bracket on any telescope. Dovetail base fits finder scope or reflex sight bracket so you can securely attach an aiming device to any telescope. Synta-style dovetail base -- Fit most bracket designs from Celestron, Orion, Sky-watcher, Vixen, etc. Compliable with finder scope, Laser Pointer bracket on telescopes. Made of high strength Aluminum with Anodizing Aluminium Process. The base is made of die-cast metal and features two large thumbscrew locks. Includes two M5 screws. Compliable with finder scope, Laser Pointer bracket or reflex sight bracket on telescopes, great for adding a second or third aiming device to your telescope. Fits factory drilled holes on Celestron, Meade, and Orion Schmidt-Cassegrain telescopes, attaches directly to Schmidt-Cassegrain Telescope (SCT) optical tube with included mounting hardware.

Finderscope: Reflex. Focus Type: Auto Focus. Product Dimensions: 1.63"D x 1.74"W x 3.06"H. Objective Lens Diameter: 30 months. Brand: Astromania. Manufacturer: Astromania. Date First Available: April 23, 2016. Is Discontinued By Manufacturer: No. Best Sellers Rank: #8 in Telescope Finder Scopes. Customer Reviews: 4.6 out of 5 stars 331 ratings 4.6 out of 5 stars. Item model number: SKU_AM_UDBFS. : B01EOET7DS. Item Weight: 1.44 ounces. Product Dimensions: 1.74 x 1.63 x 3.06 inches.