AP Astro Pneumatic Tool 94404 Magnetic Spark Plug Universal Extension Socket Set - 9/16, 14mm, 5/8, 16mm & 13/16 (3/8 Drive)

Product overview

The Astro Tools 94404 Magnetic Spark Plug Universal Extension Socket Set from AP Astro Pneumatic Tool Company brings a thoughtful combination of magnetism and versatility to spark plug service. Designed to help you work with confidence, this set pairs a full magnetic ring with a compact swivel to secure the plug while you maneuver around tight engine bays. The result is a smoother, more controlled experience when handling plugs in restricted spaces.

Key benefits at a glance

• Magnetic retention ring provides a secure hold on spark plugs, reducing the risk of drops during removal and installation.
• Universal swivel design improves access around restricted cylinder heads while maintaining a slim profile for tight clearances.
• 3/8 in drive six-point sockets in sizes 9/16 in, 5/8 in (16 mm), and 13/16 in, with engraved size markings for quick ID.
• Engineered for use with most import and domestic vehicles, covering a broad range of engines and configurations.

Design details and durability

All sizes are permanently engraved, helping you verify the right fit at a glance. The sockets’ compact outside diameter minimizes interference with surrounding components, while the magnetic ring delivers consistent engagement without relying on rubber bushings. The 3/8 in drive and six-point geometry are chosen to balance grip strength with ease of turning, so you can work with less hand fatigue over time.

Practical use scenarios

In a home garage or professional shop, you may appreciate the combination of secure retention and flexible access when replacing spark plugs in crowded valve covers. The swivel action lets you adjust angle on the fly, while the engraved sizes speed identification on busy benches. The set is suitable for a wide array of vehicles, from everyday commuters to light-duty imports and domestics.

How to use

Attach the extension socket to a 3/8 in drive ratchet or magnetic driver. Align with the spark plug, let the magnetic ring hold it, then swivel into position and loosen or tighten with controlled pressure. When finished, swap to the next size as needed.