Telescope Finder Scope Dovetail Slot Mount Bracket Base Plate Telescope Finderscope Dovetail Base Slot. Celestron C8/C8HD/C925/C11HD, Sky Rover 80ED/102ED/30APO/100ED Binoculars, Sky Watcher and other telescope Finderscope. M3 M5 thumbscrew locks, attach to telescope optical tude. Easy to put it on the optical tube and tighten the screws. Made of aluminum material, ultra-light weight and ultra-thin body. Specification: • Material：aluminum • Length*Width：34*5.1mm/1.34*0.20 inch • Horizontal Length of Internal Slot：37mm • Vertical Length of Internal Slot：35.5mm • Fitting：M3-M5 Screw