Quik Lok Heavy Duty, Double-Brace, Single-Tier X Keyboard Stand with Trigger-Lok Height Adjustment System (T-550) The ingenious TRIGGER LOK system designed by QUIK-LOK houses five positive-lock height positions and is completely sealed exposing no parts. Constructed using heavy duty 30 x 30mm steel tubing, the double-brace T/550 is strong enough to hold keyboards up to 180 lb. (81 kg). The single-tier T/550 structure is also easily expandable by adding optional QLX/1 adjustable-Second-tier or any of the available QLX accessories.