Ball Bearing - Double Swivel - Size 4 Technical specifications : block, size 4 Sheave diameter : 58 mm Sheave width : 17 mm Max. rope diameter : 12 mm Safe Working Load (SWL) : 440 kg Breakload : 1260 kg Weight: 283g Length: 138mmBall Bearing 
| Reduce friction and make adjustments under load easier and smoother. Recommended where constant adjustments are made in fairly high load situations. - Mainsheet system
- Jib/genoa sheet system
- Spinnaker lead blocks
- Mainsheet traveller controls
- Running backstays
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Barton produce a comprehensive range of lightweight blocks manufactured in England, from glass filled nylon and high grade stainless steel. The result is a range of free running blocks assuring ultimate performance, efficiency and long working life. Sheaves are moulded from Acetal resin. The ball bearing sheaves run on Delrin balls for extremely low friction.
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