80 mm Plain Bearing Block - Single, Swivel, Shackle adaptor Eye/Eye When used as a turning

When used as a turning block for spinnaker sheet

The lower T is attached to a Seldén backing plate

the swivel can handle lines up to ø12 mm

The 40 mm sheave is equipped with stainless steel ball bearings for smooth operation under dynamic loads

A plastic washer acts as a swivel lock

80 mm Plain Bearing Block - Single, Swivel, Shackle adaptor Eye/Eye When used as a turningThe PBB80 Single Block with Shackle Adaptor is designed to fit deck ring T base shafts of other mast brands. Consequently, this block is designed to route a halyard from the mast and back to the cockpit. It features an 80 mm glass fibre reinforced sheave with polymer bushing, stainless steel strap for durability, glass fiber reinforced composite cheeks to prevent jamming and a practical switch from swiveling to fixed shackle. Safe working Load: 2000