Optiparts Daggerboard Slot Insertis fitted into the daggerboard slot of an Optimist Dinghy to protect and cushion the daggerboard.Best when four pieces are fitted to for and aft and top and bottom of daggerboard slot.Rubber insert only. These slot inserts take the play out of the daggerboard system and help provide friction to keep the board in place.Dimension10 x 10 x 5 cm