1. Made of high quality ABS material, stable and firm, suitable for our using. 2. The adjustable clamp will fit most standard-sized music sheet stands and microphone stands. 3. Simple to install and convenient to disassemble, easy to carry and store. 4. Adjust the clamp-on tray to a comfortable height, lock the mount in place and you are ready to start the show 5. The plate board used to fix sound card, suitable for stage, chat room, internet bar, control room and so on. 6. Tray size: 27 x 20.6cm 7. Diameter range of clamp: 1.32cm to 3cmSpecification: Package Weight One Package Weight 0.60kgs / 1.33lb One Package Size 30cm * 22cm * 6cm / 11.81inch * 8.66inch * 2.36inch Qty per Carton 20 Carton Weight 13.00kgs / 28.66lb Carton Size 52cm * 45cm * 32cm / 20.47inch * 17.72inch * 12.6inch Loading Container 20GP: 356 cartons * 20 pcs = 7120 pcs40HQ: 826 cartons * 20 pcs = 16520 pcs