Standing Desk Converter Bundle is the perfect way to get your ergonomic workstation started. It comes with a R ADRB Sit to Stand Desk Riser and a R STFS Floor stand that lets you create an independent workstation by converting your ADRB into a full Sit-to-Stand desk. The Rocelco R ADRB-STFS Standing Desk Converter provides the proven health and energy-boosting benefits of alternating between sitting and standing during your work day, which also reduces back strain and pain. The sturdy steel frame with easy-grip side handles and pneumatic gas piston assist, allows you to easily raise 30lbs on the large 32" x 20.6" desk riser top, into infinite heights between 34" to 49" above the floor. Dual-piston lift system provides smoother more precise height adjustment with a wide range of weight on the desktop, compared to single-piston lift systems. This Sit to Stand Up Desk offers a large 23.6" x 11.6" retractable keyboard tray that slides in, pulls out and locks into place for easier access to