Holt - 180 Degree Swivel Cleat The new 180° Swivel Cleat (HA4988 ) is the successor to original HA4987 swivel cleat design with subtle improvements. The swivel cleat is a fully composite designed mast swivel fitting that is suitable for all control lines, e.g. halyards and cunninghams. This cleat was specifically developed and styled as a successor to the HA 4987 to look better and have improved strength and durability. It can be used on any dinghy and catamaran. Line Size: 6mm Height: 95.2mm Hole Centres: 70 x 1mm Weight: 108g