Harken's guide blocks guide halyards and control lines aft for | safe operation in the cockpit.| Asymmetrical sheaves of glass fibre reinforced nylon to | lift the line up off the deck and combined with | ball bearings significantly reduce friction.| The injection moulded composite top plate provides superior | strength and UV resistance. | Mounted with heavy duty bolts through the centre hole of the sheaves.| Stackable.
