Introducing the premium 21mm Spark Plug Socket with a 3/8" Square Drive, designed specifically for car engine maintenance. Crafted from cold-forged Chrome Vanadium steel, this socket is hardened, tempered, and chrome plated for exceptional durability and longevity. Its fully polished mirror finish not only adds to its aesthetic appeal but also ensures easy cleaning and maintenance. The innovative knurled ring provides a secure grip, allowing for precise handling even in challenging conditions.This socket features a specialized insert that grips the ceramic insulation of spark plugs, making it easier to extract plugs from deep-seated positions without damaging them. Ideal for both DIY enthusiasts and professional mechanics, this socket is a must-have tool for efficient engine repairs and maintenance. Key Features:- Made from hardened and tempered Chrome Vanadium steel for superior strength- Fully polished mirror finish for easy cleaning- Knurled ring for enhanced grip and control- Special insert for secure grip on ceramic insulation- Perfect for deep-seated spark plugs- Comes with a lifetime guarantee*Specifications:- Depth: Deep- Drive: 3/8" Square- Material: Chrome Vanadium- Net Weight: 0.14kg- Size: 21mmExplore our extensive range of tools and workshop equipment catering to both DIY and professional markets. With over 10,000 products available, our online store is your one-stop shop for all your tool needs. If you have trouble finding a specific item, don’t hesitate to reach out to our customer service team for assistance.