stainless steel construction for boot lift support struts. Made from stainless steel, this unit is durable and sturdy with stable performance. The cylinder uses thick precision steel pipe, delivering bearing pressure and resistance to deformation. Compatible with B M W W for BMW 5 Series F10 F11 F18, years 2011 2012 2013 2014 2015 2016 2017. Front hood bonnet compatible replacement as a gas strut lift support and related shock damper component. Based on original equipment design, this strut directly replaces worn or damaged parts. Easy installation with common hand tools, takes only a few minutes, no special tools required. The hydraulic gas rod generates force by compressing gas inside the cylinder, enabling smooth, convenient, and safe opening and closing of the trunk or hood. Practical applications: Replacing worn trunk lid (boot) lift supports on BMW 5 Series to restore reliable opening and holding. Replacing front hood/bonnet struts to ensure smooth lifting and stable engine access. Useful for maintenance tasks requiring secure and controlled opening of either the boot or hood in various conditions.