The Barton TUPHblox Size 3 double block with a swivel head is a heavy-duty marine pulley block crafted from classic Tufnol laminate. Featuring two parallel 45mm sheaves and a full 360-degree rotating head, it prevents line twisting under load. This double block is engineered for creating efficient 4:1 purchase tackle systems and high-load control lines.
Key Features:
Type: Double block with swivel head
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, halyard control, and purchase setups on sailboats and traditional vessels
