The Strainrite Wood Post Pinlock Insulator, particularly the Joule Shield™ model, is a premium electric fence insulator engineered for wood post applications, offering superior durability and performance. Constructed from long-life UV-stabilized plastic, it features a multi-shield design with a Joule Shield™ Twin shield flange, providing 100% greater insulation than other tested insulators, which minimizes power leakage and ensures efficient electric pulse transmission. The computer-aided designed pinlock mechanism offers a strong, accurate fit for easy wire installation and removal, supporting high-tensile wire, rope, tape, or braid up to 4mm (8 gauge). Reinforced web bracing and thicker walls enhance structural strength, while rounded surfaces shed water quickly, reducing maintenance in wet conditions. Backed by a 12-year guarantee and compatible with the Strainrite Holeshot staple gun adapter for fast installation, this New Zealand-made insulator is ideal for reliable, long-term livestock fencing.