... for free 2)Competivite price 3)Fast delivery time. Adjustable gas spring Advantage1)we can supply samples for free2)Competivite price3)Fast ... equipment, furniture, doors, trunk lids,cabinets,seat / chair etc Gas spring is suitable for lift up wooden door and aluminum-frame ... -buit for proper strength based on weght of door panel.Gas spring has been exported to ITALY, RUSSIA, BRAZIL, COLOMBIA, PERU, ...