The Barton TUPHblox Size 3 double block with a swivel head and integrated becket is a heavy-duty marine pulley block crafted from classic Tufnol laminate. Featuring two parallel 45mm sheaves and a 360-degree rotating head, it prevents line twisting under load. Combined with the lower becket, this block enables high-ratio 4:1 or 5:1 purchase tackle systems for demanding sailboat applications.
Key Features:
Type: Double block with swivel head and becket
Sheave Diameter: 45 mm
Max Line Diameter: 13 mm
Material: Premium Tufnol (TUPHblox) with stainless steel side straps for UV and weather resistance
Application: Ideal for high-purchase mainsheet systems, boom vangs, and heavy-duty tackle setups on sailboats and traditional vessels
