On-Stage KSA8500 Deluxe Customizable Keyboard TierCompatible with 1" square or 30mm round tube stands (adapters are supplied for compatibility with On Stage Z stands). Total supported weight is 66 lb, or 33 lb per pair of support arms. Each arm features an independent 10 increment Posi Lok adjustment for height, angle, depth, and widthproviding 43. 5" of total width distributed over a 2nd tier, or 2nd and 3rd tier configuration. The stabilizer bar telescopes to accommodate keyboard stands up to 32"