Solid metal construction ultra-thin design, ultra-. It can be installed to: for C8, C8HD, C925, C11HD, for SKYRVER: 80ED, 102ED, 130APO, for SKYRVER 100ED binoculars, and other primary mirror, can be mounted to the sharpstar, another model. Can be fixed: M3-M5 screw Astronomy telescope: Finderscope dovetail board astronomy telescope: Spotting Scopes telescope Dovetail Board: for optics Telescope Astronomical Telescope: Multi Function Finderscope Length: along the 34 mm Width of internal lock: 5.1mm Horizontal length of internal lock: 37mm Vertical length of internal lock: 35.5mm Color: black Material: Aluminum alloy Package Contents: 2 x Telescope Dovetail Slot Only the above package content, other products are not included. Note: Light 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.