45mm Automatic Aluminium Sheave Ratchet Block

These blocks are designed with lightweight ø5 mm Delrin ball bearings and are available either with a composite sheave or an aluminium sheave. < br />More grip and the ability to cope with relative thin lines.
The sheave automatically changes from free-turning to ratchet when the load increases - the sailor decides when the automatic ratchet kicks in.
The switch-over point is set using an allen key to adjust a screw inside the sheave - fast, simple, precise.