DESIGN: The Tray Holder is made to hold the laptop and projector on a tripod to simplify your presentation setup, generate a nice Display effect(Tripod stand not included) SOLID AND DURABLE: Made of Metal, non-slip pads and straps, Durable, susceptible to clean; Easy to operate WIDELY USE: This tray Holder can be used in Stage, Projector, Monitors, Laptop and other equipment; Perfect for offices, classrooms, lecture halls, meeting rooms or your own home SCREW ADAPTER: Female screw adapter, with 1/4" Convert Screw Adapter fit for all tripod install; Easy to install and remove SIZE: 13.4 x 9.4 x 0.5 inches/34 x 24 x 1.3 centimeters (L/W/H)