General description For removing damaged and broken glow plugs from cylinder heads, specifically where they have sheared off just under the hex, flush with the cylinder head. This set is suitable for glow plugs with either an M8 x 1.0 thread or M10 x 1.0 thread. It includes all necessary adaptors, centring, and thread cleaning tools to safely remove the damaged glow plug without damaging the cylinder head. Manufactured from steel.