Seville Classics Airlift HEIGHT ADJUSTABLE TABLETOP - Adjust from 27.5" to 40" high and any height between with a manually and secure with the twist-lock knob for an ergonomic and personalized workspace ERGONOMIC TILTING DESK - Tilt nearly vertical to the front and back Dual stopper ledges keep laptops and other documents from sliding off while you work Use for drafting reading music or working while standing MOUSE PAD SIDE TABLE - Install the side table to the left or right to extend your workspace for a mouse pad drink coaster or another screen like a smartphone or tablet computer MOBILE ROLLING WORKSTATION - Enjoy smooth-gliding mobility with four 1.5-inch caster swivel wheels (2 locking) Simply screw wheels in for a portable workspace that stays put when you need it Assembly is easy with all required tools and detailed instructions included It's perfect for professional environments like offices art and music studios libraries and in dentist's optometrist's and doctor's offices