Height Adjustable Tabletop - Adjust from 20.4" to 33” -- as well as any height in-between with a secure twist-lock knob for an ergonomic and personalized workspace. Tempered Glass Top – The solid glass desktop (23.6" x 15.7") is designed to fit almost any sized laptop or tablet. Mobile Rolling Desk - Enjoy smooth-gliding mobility with four 1.5-inch caster swivel wheels (with two locking). Simply screw wheels in for a portable workspace that stays put where you need it.