General description A swivel spark and glow plug socket set designed for damage-free removal and installation of spark and glow plugs, featuring protective caps for PSG glow plugs. Technical specifications 1/4""D sizes: 8, 9mm x Single Hex (6pt) 3/8""D sizes: 10, 12, 16mm x Single Hex (6pt); 14mm x Bi-Hex (12pt) Overall length: 95mm Sockets manufactured from satin finish chrome vanadium Other information Includes 6 x plastic protective caps for PSG glow plugs