Ronstan Series 40 Ratchet Orbit Block - Single - Auto - Swivel Shackle Head. This lets the sheet run out smoothly and freely-great for rapid easing of the sheet and for gybing asymmetric spinnakers. Specifications for Ronstan Series 40 Ratchet Orbit Block: Manufacturer: Ronstan Color: Black Features of Ronstan Series 40 Ratchet Orbit Block Up to 14:1 holding power - highest available Smooth easing of sheets Fully Automatic load sensing ratchet engagemen Swivel shackle head for unlmited block rotation Stainless steel shackle head for ultimate durability and compatibility with harsh fixing points Applications: Dinghy mainsheet systems Mainsheet fine tune systems on sportsboats & small keel boats Mainsheet systems on sportsboats using RF7 mainsheet swivel cleat unit Spinnaker and job sheets on dinghies - especially modern asymmetric classes Control line applications on larger yachts Materials: Sheave: Hard anodised Aluminium Ball Bearings: High compression strength carbon black Acetal Frame/Cheeks: Toughened glass fiber reinforced Nylon Rope Link: UV stabilized multi-strand impregnated SK75 Dyneema : Sheave : 40mm(1-9/16") Max. Rope : 9mm(5/16") M.W.L.: 175kg(385lbs) B. L.: 500kg(1100lbs) Weight: 44g(1.5oz) Package Contents: Ronstan Series 40 Ratchet Orbit Block Ronstan RF46100: Series 40 Ratchet Orbit Block - Single - Auto - Swivel Shackle Head