Features Up to 20: 1 holding power Smooth easing of sheets High performance cleating Swivel shackle head for unlimited block rotation. Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points. Automatic &manual ratchet block Single - Swivel Head Auto &Manual Application Mainsheet systems and spinnaker sheets on dinghies, sports boats and small keel boats to 8 m. Halyard, vang and backstay applications on boats to 8 m. Spinnaker sheets on sports boats and small keel boats (lateral lead blocks) Materials Sheave: Hard anodised Aluminum Ball Bearings: High compression strength carbon black Aceetal Frame/Cheeks: Toughened, glass fiber reinforced Nylon Rope Link: UV stabilised, multi-strand impregnated SK75 Dyneema Head fitting: grade 316 stainless steel. Ball Bearings: High compression strength carbon black Acetyl. Sheave: Hard anodised aluminum. Specification Sheave: 55 mm. Max. Rope: 10 mm. M.W.L.: 250 kg. B. L.: 650 kg. Weight: 82 g.