The 57mm block from Harken comes in three formats, the carbo, the ratchet carbo and the newer Power3 ratchet blocks. The ratchet version of the 57mm Harken block come either with on/off switches or as an automatic ratchet.
Harken 57mm blocks are lightweight, strong and reliable with a fiber-reinforced composite construction meaning they have a great strength to weight ratio.
You can expect breaking loads of up to 2,270kgs.
Explore other Harken block and pulley sizes on our Harken blocks page.