This is the strong vertical part of a shutter that includes a built-in handle and is designed to carry more weight. It is often used in large or heavy shutters like sliding doors or big window panels.
A sleeve in this case is a support or holding part used in Hi Slide walk-in wardrobes to hold and protect 4mm thick glass panels. It’s an optional part, added when glass is used in the sliding doors.
It is a small but important part used to fix and hold the sliding system of a walk-in wardrobe in place. It connects parts like tracks, brackets, or profiles securely to the wall, ceiling, or floor.