About This [Patent Design] Attach the heating and lighting device to the top of the terrarium and adjust it to a suitable height. Then install screws(4) and tighten until the lazy arm is fixed. Suitable for terrariums with a height of 11.8in-23.6in, the extension tube can be added for taller terrariums. Easy and convenient installation, no need for other installation tools. Includes metal clamp to accommodate most domes, if you have a large terrarium and need two domes, we add another tube for the second dome, package includes four rubber foot pads for the terrarium without a gap under the base 100% quality assurance: we provide 12 months of quality assurance, Should you have any inquiries regarding our product, please reach out to us, and we will respond promptly to assist you within 24 hours. Overview Brand : REPTI ZOO Special Feature : Lightweight, Easy to Use, Adjustable Specific Uses For Product : Reptile lamp fixture support for dual fixtures Light Color : Adjustable Unit Count : 1 Count