80 mm Plain Bearing Block - Single, Swivel, Shackle adaptor Eye/Eye The 40 mm sheave is

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

A "Do-it-yourself" kit based on a ø84 mm aluminium spinnaker pole section with Seldéns composite 534-854 series end fitting with trip trigger as outboard end and the aluminium 534-778 series in board end

A plastic washer acts as a swivel lock

When used as a turning block for spinnaker sheet

The lower T is attached to a Seldén backing plate

80 mm Plain Bearing Block - Single, Swivel, Shackle adaptor Eye/Eye The 40 mm sheave isThe 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