The Kauplus 1/4" + 3/8" special glow plug and spark plug socket, designed for damage free removal and installation of spark and glow plugs with ease, plus protective sleeve for Pressure Sensor Glow Plugs. 360 degree swivel spark plug socket, universal joint & long, slim design permits access to most confined area, C-RV steel constructed, overall length 95mm and fitment on most cars, trucks…i.e. for Audi, Volkswagen and Opel (eg. PSG glow plugs with OE no. General Motors GM 55564163/55577419, Opel 18 26 354/12 14 061, VW 03L905 061 D). Set Contents: 2 x 1/4"D sizes: 8mm, 9mm x Single Hex (6pt), 3 x 3/8"D sizes: 10mm, 12mm, 16mm x Single Hex (6pt), 1 x 3/8"D sizes: 14mm x Bi-Hex (12pt) And 5 x plastic protective caps for PSG glow plugs. Made in Taiwan come with blow case. The PSG-Glow plugs with pressure sensor should be mounted with protecting cap in order to save the plug-in connection of the PSG-Glow plugs from pollution and electrostatic charging. Caution: Always wear safety glasses when doing automotive maintenance for prevent any personal injury or properly damage.