The T557-1 is an aviation-grade 3/8" drive deep spark plug socket with integrated magnet, designed for safe removal and installation of aircraft spark plugs without dropping or damaging the plug in confined cylinder head spaces.

It is commonly used on piston aircraft engines (Lycoming, Continental) and is part of standard aircraft maintenance tool kits.

The internal magnet is used to retain the spark plug securely inside the socket, especially during insertion/removal in deep or angled cylinder wells where manual access is limited.

Key features include:

3/8" drive aviation spark plug deep socket
Integrated retention magnet for spark plug holding
Designed for aircraft spark plug hex sizes (typically 7/8")
Long reach for deep cylinder head access
Chrome vanadium steel construction for durability
Prevents spark plug dropping into engine bay
Used in Lycoming & Continental piston engine maintenance
Compatible with standard 3/8" ratchets and torque wrenches
Aviation MRO standard maintenance tool
Part of Unison / Tempest spark plug service tool series