45mm X2 auto-ratchet block Features_SPF50 you can upgrade to a

you can upgrade to a Kingfisher Splicing kit here or here

or a weekends worth of sailing kit with no problem

Airbag for flotation on Optimist boat

The 50mm boat block from Allen features a pro ratchet with becket and cleat jammer

45mm X2 auto-ratchet block Features_SPF50 you can upgrade to aThe X2 pawl system incorporates two pawls into the mechanism for the ratchet block allows the load to be evenly shared between both pawls, this allows the block to withstand higher working loads while also increasing both the reliability and longevity of the block when compared to the older AutoRatchet designs. Specifications Sheave size: 45 mm (1 49 64") Max. line size: 8 mm (5 16") Overall height: 90 mm (3 35 64") Breaking load: 280 kg Max. working