Holt 20mm Single Ball Bearing With Eye And Spring Ai_Description toe and bridge covers the

toe and bridge covers the high-wear zones that take the most punishment from repeated deck contact

Breaking Load 400 kg Fixing Hole Centers  30 mm Length  50 mm Maximum Line Diameter  8 mm Maximum Working Load  140 kg Shackle Pin  - Weight  24 g

Can be used on keelboats

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Designer Julian Bethwaite had also been thinking along the same lines and had produced a prototype of the keyball trapeze system

Holt 20mm Single Ball Bearing With Eye And Spring Ai_Description toe and bridge covers theHolt Allen 20mm Single Ball Bearing with eye and spring Allen 20mm Single Ball Bearing Latest design in acetal plastic with stainless straps. Sheave Diameter: 20mm Maximum Line Size: 6mm Length of Single Block = 39mm