Adjustment knobThe height of the table can be adjusted by pulling out the knobs at the same time, and the knobs will automatically bounce back into the bayonet.Angle adjustment0-75degreetempered　glass　desktop５ｍｍ　thickness31+4 bits Ipad laptop charging cart provide fasting charging and security storage for iPads, Windows, Chrome Booktablets. It is ideal for school, library, hospital, exhibition, airport,training center, etc.CASTER: Charging cart with good quality Universal Wheel makes them quiet enough and easy pushing during moving. It is quickly and easily transported even it's full loaded.CHARGE & STORE 3 DEVICES: Designed for 35 Chromebooks and versatile enough to support most tablets, laptops/hybrids and UltrabooksLOCKING & SAFETY: charging cart with lock & key for the front and back door, will Protect your devices when it's in working or you are moving the cart. And 2 locking caster wheels will keep cart in place.EASY USE: Cable management Bar make it easy for you to tidy power line and organization of cordsDURABILITY: All steel construction is fastness and durable, good anti-rust treatment and you will never worry about rust problem.