The CTA Manufacturing 6-pc Spark Plug and Glow Plug Socket Set, No. 7392, includes most popular sizes: 8mm x 6-point, 9mm x 6-point, 10mm x 6-point, 12mm x 6-point, 14mm x 12-point, and 16mm x 6-point. The set also includes five plug protectors for sensitive PSG plugs. The 6-point hex sockets have a rubber O-ring to prevent spark/glow plug from falling out. The 14mm x 12-point socket includes a magnetic ring. Each socket is equipped with 15 to 20 degree swivel range for access in tight fitting applications.