A late sell-off saw the index drop as much as 0.8 pct for the day. The Hang Seng ended 0.81 percent lower after trading in a narrow range through the day with the bulk of trading activity coming in the last hour,tracking a late sell-off in China shares. China's Shanghai Composite was down more than 1 percent at the close,reversing earlier gains,as selling in small-caps dragged the index lower. The benchmark Hang Seng Index ended down 170.48 points at 20,778.92. The China Enteprise Index of top locally listed mainland Chinese stocks fell 0.89 percent. Retailer Esprit Holdings,which receives about a quarter of its revenue from Europe,fell 4.7 percent. It was the top loser on the Hang Seng Index as a credit rating downgrade of Spain fuelled fears of eurozone instability.