Practical:This practical tray with 29-40cm in height and 13 cm indiameter, can be used universally for projectors, SLR, mixers, amplifiers,laptop, recorder audio/video devices, DJ sound equipment etc. Anti slip:Non-slip can hold the device steady, and can give you a good using experince Interface: It can have two interfaces, 3/8 inch female screw and 1/4 inch femal screw. You can a screwdriver to convert . High Quality: Tray for projector tripod made of metal, it is stronger and more durable than aluminum alloy. colour: black Material: metal Package Contents: 1 x Projector Holder Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.