The thickness of the L size is 15mm and the carrying capacity is 50 kg the thickness of the XL size is 15 mm and the carrying capacity is 60 kg The lower height has been increased to effectively isolate water and dust giving your case a cleaner look Two wheels with brakes It can remain motionless during use which improves stability The hollow design at the bottom can increase the airflow allow the PC tower to breathe freely This computer tower stand is designed to support most desktoptower computers and save space Size 124 X 2565 x 575