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

The lower T is attached to a Seldén backing plate

A plastic washer acts as a swivel lock

a becket and an integrated 27 mm composite cam cleat

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