The Sealey AK3858/A1 Heat Shrink Butt Connector Crimping Jaws are replacement jaws designed for professional crimping applications. These quick-change jaws are manufactured from hardened and tempered steel, providing durability and precision for reliable electrical connections. Specifically engineered for compatibility with Sealey models AK3857 and AK3858, these crimping jaws enable efficient servicing of multi-function crimping tools. The quick-change design allows electricians and automotive technicians to swap between different jaw configurations without delays, maintaining productivity on site or in the workshop. The jaws accommodate a comprehensive range of terminal sizes including 0.5-1mm², 1.5-2.5mm², 4-6mm², and 10mm², making them suitable for various electrical installation and automotive wiring projects. Despite their robust construction, they weigh just 0.07kg, contributing minimal additional weight to the host tool. Features and Benefits: • Quick-change design for fast jaw replacement • Hardened and tempered construction for extended service life • Compatible with multiple terminal sizes from 0.5-1mm² to 10mm² • Lightweight at 0.07kg for minimal tool fatigue Specifications: Brand: Sealey Nett Weight: 0.07kg Terminal Suitability: 0.5-1mm², 1.5-2.5mm², 4-6mm², 10mm²