<p>A: Dual-block mechanism holding telescopic tube for reliable operation; without the need of safety pin.&nbsp; Easy to adjust the height of speaker cabinet.&nbsp;&nbsp;</p>
<p>B: Air cushion mechanism to prevent from the speaker cabinet falling quickly and meanwhile ensure the safe operation;&nbsp;</p>
<p>Specification:</p>
<p>Height: 1100-1800mmLoad capacity: 60kgMaterial: aluminum alloyInner box: 130x130x1070mm (1pcs)Master Carton: 280x280x1095mm (4pcs)</p>