• Made of high quality aluminum alloy material, this product is sturdy and durable. • Easy to install and use, a great choice for astronomical telescope lovers. • All-metal precision CNC process, fine workmanship and professional design. • Fits maximum dia. 21mm, minimum 3mm laser pointer, compatible with different types of laser pointer. • Comes with 1/4 standard camera thread hole, suitable for most telescopes, like Celestron, Sky-watcher, Vixen.