The Barton TUPHblox Size 4 double block featuring a swivel head and becket is a heavy-duty marine pulley block crafted from classic Tufnol laminate. The rotating swivel head allows the block to self-align with the line pull direction to prevent rope twisting, while the dual sheaves and lower becket enable high-ratio multi-purchase tackle configurations.
Key Features:
Type: Double block with swivel head and becket
Sheave Diameter: 58 mm
Max Line Diameter: 14 mm
Material: Premium Tufnol (TUPHblox) with stainless steel side straps for UV and weather resistance
Application: Ideal for heavy-duty mainsheet tackle systems, multi-purchase setups, and control lines on sailboats and traditional vessels
