Standing Desk Converter Bundle is the perfect way to get your ergonomic workstation started. It comes with a R ADRB-45 Sit to Stand Desk Riser and a R DM2 Dual Monitor Mount. The Rocelco R ADRB-45 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 40lbs on the large 45" x 22.6" desk riser top, into infinite heights between 4.7" and 17.5" above your existing tabletop. 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 28.7" x 9.6" retractable keyboard tray that slides in, pulls out and locks into place for easier access to entire desk riser top while also helping you to get into the most comfortable