The On-Stage Stands KS8290X Lok-Tight Pro Single-X ERGO-LOK Keyboard Stand is a top-of-the-line single-X stand that"s built for pro-level work with super heavy-duty tubing and welded construction. This heavy-duty keyboard stand supports 275 pounds with height adjustment from 27"-38" and width adjustment from 12"-32". Uses ERGO-LOK technology for ease of use. The ERGO-LOK system includes an ergonomic trigger, an internal rod mechanism, and a solid steel spring-loaded deadbolt assembly. The On-Stage Stands Single-X Keyboard Stand uses dual sheer disk plates and heavy-duty deadbolt for superior stability.Built for large-format keyboards 30mm tubing Supports 275 lb. 1-1/8" tubing Height adjusts from 27"-38" Width adjusts from 12"-32" ERGO-LOK system Welded construction