Benz CDI Engine Glow Plug Tool For unscrewing and disassembly of glow plugs in the cylinder head, especially when stuck from carbonization. Eliminates need to remove cylinder head. Services 10mm glow plugs, engine codes 611, 612, 613, etc. All steel construction w/ 3/8 square drive. For unscrewing and disassembly of glow plugs in the cylinder head, especially when stuck from carbonization. Eliminates need to remove cylinder head. Services 10mm glow plugs. Engine codes 611, 612, 613, etc. All steel construction. 3/8 square drive 1074