Scope of application: OTA such as 8SE C8HD C8, installation of star guides, ZWO boxes, star finders, and other accessories. It can also be used as a handle, but it is important to note that long screws should be replaced and the installation should be stable. Important note:1: When using as a handle, it is necessary to replace the long screws, as the original screws are not long enough.. 2: During installation, tighten the two screws evenly. Screw down one screw, do not tighten it first, then screw down another screw. If one screw is tightened and then screw on the other, the curved surface will cause uneven force on the screw. Tighten evenly! 3: As a handle, the screw has sufficient strength. However, in practice, if the bolts are used too short, the number of teeth entering is small, the teeth are slippery, and the bolts are not treated with sufficient strength, etc., it may cause the handle to fall off and cause losses, and our merchant is not responsible. Users should install correctly, inspect before use, and be responsible for their own behavior. Color: black/Blue Material: Aluminum alloy + oxidation coating Package Contents: 1 x Guide rail slot 5 x screw 2 x Guide card slot 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.