Stand Up Desk Store Crank Adjustable Sit to Stand Up Computer Desk &ndash; Heavy Duty Steel Frame, 60 Inches, Silver Frame/Black Top STABLE AND SEAMLESS MOVEMENT: Smooth crank adjustment takes your desk from sitting to standing in less than one minute; lower surface adjusts from 29  43; upper surface adjusts from 33.5  47.25 ERGONOMIC DESIGN: Two-tier design keeps your arms at a 90-degree angle while typing and your computer monitors at eye level; helps improve posture and minimize discomfort MOBILE WORKSPACE: Quickly move your desk from one room to another across a variety of surfaces with four caster wheels; lock front two wheels in place for stationary work LONG-LASTING DURABILITY: Frame is constructed of durable steel and has a powder coat paint finish for enhanced quality HEALTH AND WELLNESS: Standing desk encourages greater movement throughout your day while helping optimize your cognition, improve focus, enhance collaboration, increase productivity and boost calorie burn