The cast brass ceiling assembly features a tube hook with a length of 137mm, a cup diameter of 120mm, and a cup height of 48mm, with a safe working load (SWL) of 75kg. It consists of a bar with a loop at each end and a cup that slides up and down between them. The top loop hooks onto a ceiling hook (refer to our comparison chart to select the appropriate hook if needed), while the cup slides up to cover the hook and is secured in place by a collar with a locking screw. The loop at the other end connects to the chain for the light fixture.