Barton Marine Ratchet Block - 55mm [90500]Ratchet Block 55mm The Barton Ratchet Block is designed to be used on mainsheet systems and spinnaker sheets on dinghies and keelboats and for small yachts up to 30 feet. Combining high performance engineering and contemporary design, the 2 3 16" (55 mm) ratchet block is the first in a planned range of sizes, it also offers a stainless steel lever that locks the swivel head if desired. The new Ratchet Block allows sailors to easily handhold loaded