The EUROLITE MCS-1/Q 2.5-4.2m is an aluminum crossbar designed for the MCS-4248 Mobile Curtain Stand. Its adjustable width ranges from 270 cm to 480 cm, allowing it to accommodate different curtain-system configurations. The crossbar has a diameter of 3.8 cm and weighs 2.35 kg. It is a passive, manually installed structural component with no electrical or control requirements.