This Harken 40 Self-Tailing Radial All-Chrome Winch - 2 Speed, also known as Part No. 40.2STCCC, has a maximum line Ø of 12 mm (1/2 in). The winch is self-tailing and has a power ratio of 1 at 13.50 and 2 at 39.90. The drum surface is specifically designed to grip the line and reduce wear, with diagonal ribs instead of abrasive materials. With the self-tailing mechanism, one crew member can easily trim or raise sails.