Sealey 3/8" Drive Magnetic Spark Plug Socket Metric 3/8" 21mm

About this tool

The Sealey 21mm 3/8" Drive Magnetic Spark Plug Socket accommodates larger metric spark plugs found in various engine types, including certain motorcycles, marine engines and commercial vehicles. The 21mm size provides the additional clearance required for bulkier spark plug designs whilst maintaining secure grip. Featuring an integrated magnetic retention system, this socket holds spark plugs firmly throughout the removal and installation process, preventing costly drops that could damage the plug insulator or threads. The magnetic function is especially beneficial when working at awkward angles or in deep spark plug wells. Manufactured from forged Chrome Vanadium steel with hardening and tempering treatment, the socket delivers professional-grade durability and resistance to rounding or deformation. The chrome plated finish ensures long-term corrosion resistance even in damp workshop environments. The 3/8" square drive connects seamlessly with standard ratchets, torque wrenches and extensions. Features and Benefits: • 21mm socket for larger metric spark plugs • Magnetic retention prevents plug damage from dropping • Forged Chrome Vanadium steel for lasting strength • Hardened, tempered and chrome plated • 3/8" drive compatible with standard tool accessories Specifications: Brand: Sealey Drive: 3/8"Sq Length: 62mm Nett Weight: 0.14kg Size(s): 21mm

Retailer description · Tooled Up · Observed 12 Oct 2026. Check the retailer’s listing for full specifications and contents.