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 from 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. | Number of sheaves: 4. Sheave size: Ø40mm. Max line: Ø12mm.| Length: 190 mm. Height: 24 mm. | Max load per sheave: 700 kg. Weight: 135 g.
