This is the Gravity SA BTRAY 1 beamer tray for 35mm diameter speaker, lighting and microphone stands. This is an incredibly handy device for anyone who wants to get the most use from their existing stands without having to spend out more money on all-new equipment. The Gravity SA BTRAY 1 can hold anything from monitor speakers, laptops, media players or even items you need to keep handy but safely off of the floor.This convenient tray mounts to any 35 mm diameter pole and converts standard speaker stands into a multimedia projector stand. Providing a flat surface of 42 x 38 cm, it also accomodates laptops, blue-ray players, monitor speakers and other equipment up to 30 kg weight. The strong all-steel construction features a 10 mm lip around the edges to add rigidity and prevent items from falling off.