This especially designed, thin walled spark plug socket with a spring clip to hold the plug Especially designed, thin walled spark plug socket with a spring clip to hold the plug. Thin walled. Used on most Citro&235;n vehicles plus other manufacturer's fitted with Bosch spark plugs such as BMW E90335I N54 engine 2006 BMW Mini Mercedes-Benz M156 engine Peugeot 207 & 307 Renault 1.2 16v. Made from Chrome Vanadium.14mm Bi-Hex x 65mm 12pt 3/8D.