A60 - 60 mm Automatic Ratchet Block, Cheek, Anti-Clockwise Type B see instruction:

see instruction:

The BBB20 single ball bearing block with shackle is ideal for trim lines on smaller boats

For boats with a RM over 25 kNm

Complete with 2 drum halves

A60 - 60 mm Automatic Ratchet Block, Cheek, Anti-Clockwise Type B see instruction:TECHNICAL FEATURES The block is designed with lightweight Delrin ball bearings and comes with a composite sheave. The Sheave turns freely anti clockwise. When used as a turning block for spinnaker sheet, fit it on port quarter. 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.