Sheet music holder has a 5-position height adjustment mechanism, can be easily folded for transport, and attaches via the Grip-Lok 30 non-slip, aluminum alloy locking collar.When you buy a QLX stand, you just don't buy any X stand, you invest in a system that can be configured in a variety of ways to fit your needs. The QLX-5 fits any QLX-series stand as well as any Quik-Lok single-tier X stand with a QL prefix. A strong, non-slip, lightweight aluminum alloy locking collar called the Grip-Lok 30 is used to anchor the QLX-5 to the stand or to the QLX-3.