This furling drum is a part of the Harken Small Boat Furling System that offers the option of furling to dinghy or trailerable boats. Drum contains multiple stacked races of high quality bearings to ensure efficient rotation under load.
All Small Boat furling systems require a jib with a luff wire properly seized to the sail. The halyard swivels run over the wire so sail can be raised and lowered without removing the headstay. Swivels also allow independent luff tensioning.