Barton Marine Ratchet Block 55mm. 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 lines and offer a balance between holding power and controlled easing.Designed for low friction and longevity in harsh marine environments the Ratchet Block body is manufactured from a composite of high-density nylon and glass fiber reinforced polymer with a high level of UV protection. Specifications for Barton Marine Ratchet Block: Manufacturer: Barton Marine Length: 55 mm Package Contents: Barton Marine Ratchet Block Barton Marine 90500: Ratchet Block 55mm