Item Type: Dovetail Base Material: Aluminum Alloy Upper Edge: 23.4mm Center Edge: 34mm Slot Edge: 9.5mm Lower Edge: 34mm Cross Hole Width: 5mm Cross Hole Can Be Fixed: M3M5 Screws Usage: for C8 C8HD C925 C11HD, for Sky Rover 80ED 102ED 130APO and for 100ED Binoculars, Can Also Be Mounted On for Sharpstar, for SkyWatcher Other Models. Package List 1 x Dovetail Base 1 x Wrench 2 x Screw 1SUITABLE FOR: For C8 C8HD C925 C11HD, for Sky Rover 80ED 102ED 130APO and for 100ED Binoculars, also compatible with for Sharpstar, for SkyWatcher Other Models. 2UNIQUE DESIGN: Equipped with two large thumbscrew locks. Includes two M4 screws. Ensures a slippy surface and precise track cutting, perfect for your telescope. 3WIDE COMPATIBILITY: Perfect for custom mounting any viewfinder, EZ viewfinder reflex sight and green laser pointer mount on any telescope. 4EASY TO USE: dovetail base fits finder scope or reflector mounts so you can securely attach the sighting device to any telescope. 5DURABLE MATERIAL: Made of premium aluminum alloy, sturdy and durable. With it, you can attach a telescope star guide mirror to your telescope.