Midrange double deck organizer leads halyards and control lines aft, allowing crew to sail from the security of the cockpit.
Deck organizers lead a large number of lines through a small space. Harken Deck Organizers include ball bearing sheaves with hardkote-anodized cheekplates and are available in double, triple and stacked double and triple configurations.
Lines you might lead aft include halyards, reefing lines, outhaul, Cunningham, vang or spinnaker pole topping lift
Boats to 40' (15m) can generally use Midrange organizers